Client-Side Validation: When validation is done on the client browser, then it is known as Client-Side Validation. We use JavaScript to do the Client-Side Validation.
Server-Side Validation: When validation occurs on the server, then it is known as Server-Side Validation. Server-Side Validation is a secure form of validation. The main advantage of Server-Side Validation is if the user somehow bypasses the Client-Side Validation, we can still catch the problem on server-side.