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...

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>...

Responsive web design provides an optimal experience, easy reading and easy navigation with a minimum of resizing on different devices such as desktops, mobiles and tabs, Responsive web design uses only HTML and CSS , it is not a program or a JavaScript. When you use CSS and HTML to resize, hide, shrink, enlarge, or move the content to make it look good on any screen it is called Responsive Web Design. Web pages can be viewed using many different devices like desktops, tablets, and phones. Your web page should look good, and be easy to use, regardless of the device Web pages should not leave out information to fit smaller devices, but rather adapt its content to fit any device. VIEWPORT The viewport is the user's visible area of a web page, the viewport varies with the device, and will be smaller on a mobile phone than on a computer screen. Before tablets and mobile phones, web pages were designed only for computer screens, and it was common for web pages to have a static design an...

Conditional statements are used to perform different actions based on different conditions , you need to use conditional statements that allow your program to make correct decisions and perform right actions. In JavaScript we have the following conditional statements: Use if to specify a block of code to be executed, if a specified condition is true Use else to specify a block of code to be executed, if the same condition is false Use else if to specify a new condition to test, if the first condition is false Use switch to specify many alternative blocks of code to be executed if Statement if statement is used to specify a JavaScript code to be executed if a condition is true , here a JavaScript expression is evaluated , If the resulting value is true then the given statements are executed. If the expression is false, then no statement would be not executed. if Statement Syntax if (condition) { code to be executed if the condition is true } else Statement The else statement is used to ...

A script is a small piece of program that can add interactivity to the website. For example, a script could generate a pop-up alert box message, or provide a dropdown menu. This script could be written using Javascript or VBScript , various small functions, called event handlers can be written using any of the scripting language and then you can trigger those functions using HTML attributes. The <script> tag is used to define a clientside script, such as a JavaScript. EXTERNAL & INTERNAL SCRIPTS : External Javascripts : If the functionality to be defined is used in various HTML documents then it's better to keep that functionality in a separate Javascript file and then include that file in your HTML documents. A Javascript file will have extension as .js and it will be included in HTML files using script tag. Example for External Javascript : <!DOCTYPE html>  <html>  <head>  <title>External Script</title>  <script src="/html...