Basic Internet Terminology
The Internet is a massive, globally connected network of computers. To understand how it works, we first need to be familiar with the core terminology that describes its infrastructure and services.
Let's break down the most essential internet terms you will encounter in Computer Networks.
1. The Foundation of the Web
- Internet: A global system of interconnected computer networks that use the standard Internet Protocol suite (TCP/IP) to link billions of devices worldwide. It is the underlying physical and logical infrastructure.
- World Wide Web (WWW): An information system built on top of the Internet where documents and web resources are identified by URLs, interconnected by hypertext links, and accessed by web browsers.
- ISP (Internet Service Provider): A company or organization that provides individuals and businesses with access to the internet and related services.
- Web Browser: A software application used to access, retrieve, and display content on the World Wide Web.
2. Navigation and Addressing
- URL (Uniform Resource Locator): The specific address of a unique resource on the Web. For example, `https://www.google.com` is a URL.
- IP Address (Internet Protocol Address): A unique numerical label (like `192.168.1.1`) assigned to every device connected to a computer network. It acts as the physical address for routing data to the correct destination.
- DNS (Domain Name System): Often called the 'phonebook of the Internet'. It translates human-readable domain names (like `google.com`) into machine-readable IP addresses so browsers can load internet resources.
3. Communication and Data Transfer
- Client and Server: A Client is a device or software that requests a service. A Server is a powerful computer that provides the requested service or data.
- HTTP / HTTPS: HyperText Transfer Protocol is the foundation of data communication for the web. It defines how messages are formatted and transmitted. HTTPS is the secure, encrypted version of HTTP.
- Packet: Data sent across the internet isn't sent as one giant file. Instead, it is broken down into tiny formatted units called packets. These packets travel independently and are reassembled at the destination.
4. Network Performance
| Term | Definition | Analogy |
|---|---|---|
| Bandwidth | The maximum rate of data transfer across a network path in a given amount of time (often measured in Mbps or Gbps). | The width of a highway. A wider highway (higher bandwidth) allows more cars (data) to travel at once. |
| Latency (Ping) | The time it takes for a data packet to travel from its source to its destination and back. | The speed limit and distance of the highway. Even on a wide highway, if the distance is far, it takes longer to arrive. |