There are two subprograms, or sets of code, that are common for any web application: client-side code and server-side code. These programs run separately, yet concurrently, with the shared goal of delivering a seamless web experience for users.

• Client-side code is the code that resides in the browser and responds to user inputs
• Server-side code is the code that resides in the server and responds to HTTP requests
  When developing a web application, the developer is responsible for deciding which code should go on the server and what they should do in relation to the client-side code. Any code that is capable of responding to HTTP requests can run on a server, and languages like PHP, Java, Python, C#, and Ruby on Rails are widely used for server-side coding.

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