Internet & Web
Concepts (2)
The **World Wide Web** is an information system accessed via **Internet**, using **HTML** for web pages, **HTTP/S** for communication, and **URLs** for addresses.
What It Is
The World Wide Web (WWW), often called the Web, is a global system of interconnected computer networks that uses HTTP to transmit data. It's a system of interlinked hypertext documents accessed via the Internet. HTML is the standard markup language used to create web pages, defining their structure and content.
Key Facts
- World Wide Web (WWW): A vast collection of digital documents and other resources, linked by hyperlinks and URLs, accessible via the Internet. It's an application built on top of the Internet.
- HTML (HyperText Markup Language): The standard language for creating web pages. It uses tags to structure content like headings, paragraphs, images, and links.
- HTTP (HyperText Transfer Protocol): The foundational protocol for data communication on the WWW. It defines how messages are formatted and transmitted, and what actions web servers and browsers should take in response to various commands. Uses Port 80.
- HTTPS (HyperText Transfer Protocol Secure): A secure version of HTTP. It encrypts communication between a web browser and a web server using SSL (Secure Sockets Layer) or TLS (Transport Layer Security) protocols. Essential for secure transactions. Uses Port 443.
- URL (Uniform Resource Locator): The address of a given unique resource on the Web. It specifies the location of a resource and the mechanism for retrieving it (e.g.,
https://www.example.com/page.html). - Web Server: A computer program that stores web pages (HTML files, images, etc.) and delivers them to web browsers upon request, using HTTP/S.
- Web Browser: Software application used to access, retrieve, and display information resources on the WWW (e.g., Chrome, Firefox, Edge). It interprets HTML, CSS, and JavaScript.
- Web Page: A document or information resource suitable for the WWW and accessible via a web browser. Typically written in HTML.
- Hyperlink: An element in an electronic document that links to another part of the same document or to another document or resource. It's the 'H' in HTML.
- CSS (Cascading Style Sheets): A style sheet language used for describing the presentation (look and formatting) of a document written in HTML. It controls colors, fonts, layout, etc.
Exam Traps
- Internet vs. WWW: The Internet is the global network infrastructure; the WWW is a system of linked documents and resources built on top of the Internet. Don't confuse them.
- HTML vs. CSS: HTML provides the structure and content of a web page, while CSS dictates its style and presentation.
- HTTP vs. HTTPS: Remember HTTPS adds encryption (SSL/TLS) for security and uses Port 443, while HTTP is unencrypted and uses Port 80.
Quick Recall
WWW = Information system. HTML = Structure. CSS = Style. HTTP = Unsecure transfer (Port 80). HTTPS = Secure transfer (Port 443). URL = Address. Browser = Viewer. Server = Provider.
Detailed Analysis
The World Wide Web operates on a client-server model. When you type a URL into your web browser (the client), the browser sends an HTTP/S request to the corresponding web server. The Domain Name System (DNS) translates the human-readable domain name (e.g., google.com) into an IP address that the server understands. The web server then locates the requested web page (an HTML file, often with associated CSS and JavaScript files) and sends it back to the browser via HTTP/S.
The browser then interprets the HTML to understand the page's structure and content. It applies the styling rules from CSS to render the page visually, and executes any JavaScript for interactive elements. This entire process happens within milliseconds, allowing users to seamlessly navigate through vast amounts of information.
Comparison Table
| Feature | HTTP (HyperText Transfer Protocol) | HTTPS (HyperText Transfer Protocol Secure) |
|---|---|---|
| Purpose | Standard protocol for data transfer on WWW | Secure version of HTTP |
| Security | Data is sent in plain text (unencrypted) | Data is encrypted using SSL/TLS |
| Port | Port 80 | Port 443 |
| Use Case | Non-sensitive data, older websites | E-commerce, banking, logins, sensitive data transfer |
| URL Prefix | http:// | https:// |
| Feature | HTML (HyperText Markup Language) | CSS (Cascading Style Sheets) |
|---|---|---|
| Purpose | Defines the structure and content of a web page | Defines the style and presentation of a web page |
| Function | Uses tags to organize text, images, links | Controls colors, fonts, layout, spacing |
| File Type | .html, .htm | .css |
| Role | The 'bones' of the webpage | The 'skin' and 'makeup' of the webpage |
Recent Updates
HTML5 is the latest major version of HTML, introducing new semantic tags (e.g., <header>, <nav>, <article>, <section>), multimedia support (<audio>, <video>), and improved APIs for web applications. CSS3 introduced advanced styling features like animations, transitions, and responsive design capabilities, crucial for modern web development and mobile compatibility.
Related Topics
- JavaScript: A programming language that enables interactive web pages. It works alongside HTML (structure) and CSS (style) to create dynamic content.
- XML (eXtensible Markup Language): A markup language designed to store and transport data, not to display it. It's often used for data exchange between systems.
The Internet is a global network connecting devices. Key concepts include **IP addresses**, **URLs**, **DNS**, **browsers**, **search engines**, and **ISPs**, crucial for SSC CGL.
What It Is
The Internet is a vast, global network of interconnected computer networks that uses the standard Internet Protocol Suite (TCP/IP) to serve billions of users worldwide. It's a network of networks, enabling data communication and resource sharing.
Key Facts
- Internet: A worldwide system of computer networks that facilitates data exchange and communication.
- IP Address (Internet Protocol Address): A unique numerical label assigned to each device connected to a computer network that uses the Internet Protocol for communication. It identifies the device on the network.
- Domain Name: A human-readable and memorable name (e.g., google.com) that corresponds to an IP address, making it easier to locate websites.
- URL (Uniform Resource Locator): The complete address used to locate a resource on the internet. It includes the protocol, domain name, and path (e.g.,
https://www.example.com/page.html). - DNS (Domain Name System): A hierarchical and decentralized naming system that translates human-readable domain names into machine-readable IP addresses.
- Web Browser: Software application used to access and view websites on the World Wide Web (e.g., Google Chrome, Mozilla Firefox, Microsoft Edge).
- Search Engine: A software system designed to carry out web searches, meaning it searches the World Wide Web in a systematic way for particular information specified in a textual web search query (e.g., Google Search, Bing, DuckDuckGo).
- ISP (Internet Service Provider): A company that provides individuals and organizations with access to the Internet (e.g., Jio, Airtel, BSNL).
- Bandwidth: The maximum rate of data transfer across a given path. It's typically measured in bits per second (bps), kilobits per second (Kbps), megabits per second (Mbps), or gigabits per second (Gbps).
- Broadband: High-speed internet access that is always on and faster than traditional dial-up access. It includes technologies like DSL, cable, fiber optic, and satellite.
- Protocols: Key protocols include HTTP (Hypertext Transfer Protocol) for transferring web pages and HTTPS (Hypertext Transfer Protocol Secure) for secure, encrypted communication.
Exam Traps
- Browser vs. Search Engine: Don't confuse a web browser (the software to view pages) with a search engine (the tool to find pages). Chrome is a browser; Google is a search engine.
- Full Forms: Be ready for full forms like URL, DNS, ISP, HTTP, HTTPS, IP.
- Identifying Non-Browsers: Questions often ask to identify which option is NOT a browser (e.g., listing Chrome, Firefox, Safari, and Google Search).
Quick Recall
Internet: Global network. IP Address: Device ID. Domain Name: Human-readable ID. URL: Full web address. DNS: Translates names to IPs. Browser: Views web. Search Engine: Finds web info. ISP: Provides internet. Bandwidth: Data speed. Broadband: High-speed internet. HTTP/HTTPS: Web protocols.
Detailed Analysis
The Internet's foundation is its client-server model and the TCP/IP suite. When you type a URL into your web browser, the DNS system is crucial. It acts like a phonebook, translating the domain name (e.g., google.com) into its corresponding IP address (e.g., 142.250.190.46). Without DNS, you'd have to remember complex numbers for every website.
ISPs are the gatekeepers to the internet, providing the physical connection and managing the data flow. The speed of this connection is determined by your bandwidth. Higher bandwidth means faster downloads and smoother streaming. Broadband encompasses various high-speed connection technologies, replacing slower dial-up methods.
Security is paramount, hence the shift from HTTP to HTTPS. HTTPS encrypts data transferred between your browser and the website, protecting sensitive information like passwords and credit card details. This encryption is vital for online transactions and privacy.
Comparison Table
| Feature | Web Browser | Search Engine |
|---|---|---|
| Purpose | Software to access and display web pages. | Tool to find information on the web. |
| Function | Renders HTML, CSS, JavaScript; navigates URLs. | Indexes web content; processes queries. |
| Examples | Google Chrome, Mozilla Firefox, Safari. | Google Search, Bing, DuckDuckGo. |
| Relationship | You use a browser to access a search engine. | A search engine is a service accessed via a browser. |
Recent Updates
The internet continues to evolve with the rollout of IPv6, addressing the exhaustion of IPv4 addresses by providing a much larger address space. Fiber optic broadband is becoming more prevalent, offering significantly higher speeds and lower latency. The rise of 5G mobile networks is also expanding high-speed internet access to more devices and locations.
Related Topics
- Networking Fundamentals: OSI Model, TCP/IP Model, Routers, Switches.
- Cybersecurity: Firewalls, VPNs, Malware, Phishing.
- Cloud Computing: SaaS, PaaS, IaaS.
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