What is internet? How it work?

 The internet is a global network of interconnected computers and other devices that allows them to communicate and share information. It works through a system of protocols (such as TCP/IP) which define how data is transmitted and received over the network.

Here’s a basic overview of how the internet works:

1. **Devices and Infrastructure**: Devices like computers, smartphones, routers, and servers are connected to each other through physical cables, wireless signals, or satellite links. These devices form the infrastructure of the internet.

2. **IP Addresses**: Each device connected to the internet is assigned a unique numerical label called an IP (Internet Protocol) address. This address identifies the device and allows it to communicate with other devices on the network.

3. **Routing**: Data sent over the internet is broken down into small units called packets. Each packet contains the sender's and receiver's IP addresses, as well as a portion of the data being transmitted. Routers are devices that forward packets between different networks to ensure they reach their destination efficiently.

4. **Protocols**: Protocols are rules that govern how data is transmitted and received over the internet. TCP (Transmission Control Protocol) and IP (Internet Protocol) are fundamental protocols that define how devices establish and maintain connections, and how data packets are addressed, routed, transmitted, and received.

5. **Servers and Clients**: Servers are computers or software applications that provide services or resources (like websites, email, or files) to other computers on the network (known as clients). Clients request information from servers by sending requests over the internet, and servers respond by sending the requested data back to the clients.

6. **DNS**: DNS (Domain Name System) is a hierarchical naming system that translates human-readable domain names (like www.example.com) into IP addresses. This allows users to access websites and other internet resources using easy-to-remember names rather than IP addresses.

7. **Security**: Security measures such as encryption (e.g., HTTPS for secure web browsing), firewalls, and authentication protocols are used to protect data and ensure safe communication over the internet.

In essence, the internet works by connecting devices globally through a system of networks and protocols, enabling communication and the exchange of information across the world.