A Web server is a program that uses Hypertext Transfer Protocol(HTTP) to serve the files to users, in response to their requests which are forwarded by HTTP clients on their machine.

The requests are sent by client programs at users end. The client may be a web browser client like (Mozilla Firefox, Google Chrome, Opera, Microsoft Edge or Apple’s Safari) or it can be an Api development and testing programs like (SoapUI, Katalon studio or Postman)

Some of the popular and most widely used web server tools are Nginx, Apache and Microsoft IIS.