What is a Website or Webpage?

A Website or Webpage is an application that runs in a web browser over the World Wide Web (Internet). All over the world web applications are developed for publicity, Marketing, Sales etc of their products over the Internet. 

The above diagram shows the exact flow of viewing the Webpage on your web browser on the Client .

Client Requests the Webpage via HTTP Request being sent to the server. Server responds with the HTML, CSS, and Javascript files to the client browser and displays the webpage. For dynamic websites like Signup pages and Login pages Client's input data is transferred to the server which runs associated PHP file  to which the User information is passed and stores in Mysql Database. PHP and Mysql runs on server side. In this way user gets to interact or see the particular websites.