Localhost works by using the loopback network interface, which is a virtual network interface that allows a computer to communicate with itself. When you access 'localhost' or the IP address 127.0.0.1, the operating system routes the network traffic back to the same machine instead of sending it out to an external network.
Here's how it works:
DNS Resolution: When you type 'localhost' in a web browser or application, the system resolves it to the IP address 127.0.0.1.
Network Stack: The request is processed by the network stack of the operating system, which recognizes that the destination is the local machine.
Loopback Interface: The request is sent through the loopback interface, which is a special network interface that handles traffic directed to the local machine.
Service Handling: If there is a service (like a web server) running on the local machine that is listening on a specific port (e.g., port 80 for HTTP), it will receive the request and respond accordingly.
This mechanism allows developers to test applications locally without needing an internet connection or exposing them to external users.
