Computer Free Learning

 Facebook, founded by Mark Zuckerberg in 2004, is a prominent social media platform that has revolutionized the way people connect, share, and communicate online. With over a billion active users globally, Facebook has become an integral part of modern digital culture. Here are some key aspects to consider: 1. **Social Networking**: Facebook is primarily a social networking platform, allowing users to create profiles, connect with friends, family, and colleagues, and share updates, photos, videos, and more. It enables users to maintain virtual connections and stay updated about each other's lives. 2. **News Feed**: The central feature of Facebook is the News Feed, where users see a stream of content from their friends, pages they follow, and groups they're a part of. This includes status updates, photos, links, and videos. 3. **Profile**: Users create profiles that represent their identity on the platform. Profiles include personal information, a profile picture, and a timeline...

ChatGPT is a revolutionary language model developed by OpenAI, built on the GPT-3.5 architecture. It represents a significant advancement in natural language processing and human-computer interaction. ChatGPT is designed to engage in dynamic and contextually relevant conversations with users, making it a versatile tool for a wide range of applications. At its core, ChatGPT is trained on a diverse dataset that includes a vast amount of text from books, websites, articles, and other sources. This extensive training enables it to understand and generate human-like text, making it capable of responding to a multitude of prompts and questions. The model has a "knowledge cutoff," which means it's not aware of events or developments that have occurred after its last training data update, in this case, September 2021. ChatGPT's architecture is based on a transformer model, which allows it to process and generate text in a highly coherent and contextually appropriate manner. I...

Android development refers to the process of creating applications for devices that run on the Android operating system. Android is an open-source mobile operating system developed by Google, and it powers a majority of smartphones, tablets, smart TVs, and other devices. Android apps can be developed using various programming languages and tools, but the most common approach involves using Java or Kotlin programming languages in combination with the Android Studio Integrated Development Environment (IDE). Key Components of Android Development: 1. Activities: An Activity represents a single screen with a user interface. Android apps are composed of one or more activities, and users navigate between them. 2. Fragments: Fragments are smaller modular components that can be combined within an Activity to create a flexible UI design, particularly useful for tablets and larger screens. 3. Views and Layouts: Views are the building blocks of the UI, representing buttons, text fields, images, et...

System analysis and design is a critical phase in the development of software systems. It involves a structured approach to understanding, defining, and designing solutions to meet business needs or address problems. This process ensures that the resulting system is efficient, effective, and aligned with user requirements. Let's delve into the key components and stages of system analysis and design:  1. System Analysis: Understanding Requirements and Problems In this stage, system analysts gather and analyze information to understand the current system or business processes, identify problems, and determine user needs. The goal is to define the scope and objectives of the project.  Requirements Gathering:  Analysts interact with stakeholders to gather requirements, including functional, non-functional, and user-specific needs. Interviews, surveys, observations, and workshops are used to collect detailed information. Problem Identification:  Existing problems, ineffic...

An operating system (OS) is a software layer that acts as an intermediary between computer hardware and user-level applications. It manages and coordinates hardware resources, provides an environment for software execution, and offers various services to both users and applications. Let's delve into the key components and functions of an operating system:  1. Kernel:  The Core Component The kernel is the heart of the operating system. It manages hardware resources, enforces security, and provides essential services. It consists of several core components: - Process Management:The kernel manages processes, which are instances of running programs. It schedules processes, allocates CPU time, and facilitates inter-process communication.   - Memory Management:The OS handles memory allocation and deallocation, ensuring efficient use of available memory. It creates a virtual memory space, allowing processes to access memory addresses that may not correspond directly to phy...

An algorithm is a step-by-step procedure or set of rules for solving a problem or performing a specific task. Algorithm analysis involves evaluating the efficiency and performance of algorithms, particularly in terms of their time and space complexities.  These complexities provide insights into how an algorithm's runtime and memory requirements grow as the input size increases.  Time Complexity: Time complexity measures the amount of time an algorithm takes to run as a function of the input size. It helps us understand how the algorithm's performance scales with larger inputs. Common notations used to express time complexity include Big O, Big Theta, and Big Omega. - Big O Notation (O()): It represents the upper bound on an algorithm's runtime.  For an algorithm with time complexity O(f(n)), the runtime won't exceed a constant multiple of f(n) for large inputs. -Big Omega Notation (Ω()): It represents the lower bound on an algorithm's runtime.  For an algorithm w...

Object-oriented programming (OOP) is a paradigm that revolutionized the way software is designed, developed, and maintained.  It is built on the fundamental concept of "objects," which encapsulate both data and the methods (functions) that operate on that data. OOP offers a structured approach to software development by modeling real-world entities as objects, allowing for more organized, modular, and scalable codebases. At its core, OOP is guided by four key principles: encapsulation, abstraction, inheritance, and polymorphism.   1. Encapsulation: Encapsulation refers to the bundling of data and the methods that manipulate that data into a single unit, known as a class. This concept promotes information hiding, as the internal workings of an object are concealed from external entities, enhancing data security and reducing the risk of unintended interference.   2. Abstraction: Abstraction involves simplifying complex reality by modeling classes based on their e...

DBMS Tables A table is a set of data represented by columns and rows. A column is referred to as a field and a row is a combination of column values and is referred to as a record. Tables contain a unique set of characteristics and they store data of the same type in each row. Data Fields A data field which is one piece of information you track in your database. Each data field in the table can define the characteristics of its data as a string value, numeric value, date and/or time values. Relationships A relational database contains tables that relate to another table by using a relationship. The tables are connected by a common field. The relationships are defined as: One to Many: this is the most common type of a table relationship. For every record in Table A, there are multiple records in Table B.  Example: There is a one to many relationship between the Customers table and Orders table. A customer may have many orders in the Order table. Many to Many: For every record in Table A...

A database is an organized collection of data that is stored electronically. It is designed to be efficient, secure, and scalable, and is typically managed by a database management system (DBMS). A database consists of one or more tables, each of which contains a set of related data. Tables are organized into rows and columns, with each row representing a unique record and each column representing a data field. For example, a table might contain customer records, with each row representing a single customer and each column representing a piece of information about the customer, such as their name, address, and phone number. Here are some of the key features of a database: Data organization: A database is designed to organize data in a way that is efficient and easy to access. This typically involves breaking down complex data structures into simple tables that can be easily searched and sorted. Data consistency: A database is designed to ensure that data is consistent and accurate. Thi...

A database management system (DBMS) is a software application that is used to manage and organize data. It is designed to allow users to store, retrieve, modify, and analyze data in a structured and efficient way. A DBMS typically includes a set of tools for managing data, including a database engine, a query language, and tools for designing and maintaining databases. Some of the key features of a DBMS include: 1. Data modeling: A DBMS allows users to create a conceptual and logical model of the data that they want to store in the database. This involves defining entities, attributes, and relationships between them. 2. Data storage: A DBMS provides tools for storing data in a structured way, using tables or other data structures. It also manages the physical storage of data on disk or other storage media 3. Data retrieval: A DBMS allows users to retrieve data from the database using a query language. The query language enables users to specify the criteria for selecting data from the...

A step by step instructions and guidance  on how to create a Google form Create,send,share and edit a form Google  forms are a useful tool to help you plan events, send a survey, give students  a quiz, or collect other information in an easy, streamlined way. Google forms are available for the public to access by simply giving the URL of the form to those who need to complete the form. When you send or share a form,recipients’ responses will automatically be collected.  A Google form is automatically connected to a spreadsheet with the same title.The spreadsheet defaults to private sharing. You will need to access the spreadsheet to update the sharing rights for the spreadsheet that contains the responses from completed forms. Create and send a Google form You can create and share a form from your Documents List or from any existing spreadsheet . Create a form from your Documents List: 1. Click Create new > Form. The form you create will be connected to a  sp...

Ready to start learning the best five tips to identify and clarify spam emails from your computer system Android phone. while many experienced internet users (and inexperienced as well) are used to seeing literally thousands of unread letters in their inbox, some of us want to keep the mail organized. It is also never a pleasant experience to be bombarded by spam emails.  The problem is that many spam letters actually contain viruses and other malicious content that should never be viewed or even opened. In order to avoid such things, you need to learn how to identify spam emails from regular letters sent to you by businesses and friends. Corporations devote significant resources to fight spammers, but a single user cannot rely on automation and vast resources. So what should you do? Know your enemy Spam is what we call all emails that are sent out by businesses and scammers to access wide audiences. While the vast majority of spam is harmless and will collect cybernetic dust in yo...

A full details of html tags in summary Basic Tags <html> </html> Creates an HTML document <head> </head> Sets off the title & other info that isn't displayed <body> </body> Sets off the visible portion of the document <title> </title> Puts name of the document in the title bar; when bookmarking pages, this is what is bookmarked Body attributes (only used in email newsletters) <body bgcolor=?> Sets background color, using name or hex value <body text=?> Sets text color, using name or hex value <body link=?> Sets color of links, using name or hex value <body vlink=?> Sets color of visited links, using name or hex value <body alink=?> Sets color of active links (while mouse-clicking) Text Tags <pre> </pre> Creates preformatted text <h1> </h1> --> <h6> </h6> Creates headlines -- H1=largest, H6=smallest <b> </b> Creates bold text (should use <strong>...