Answer:   Client-side validations take place at the client end with the help of JavaScript and VBScript offering a better user experience. The inputs for client-side validation are validated in the user’s browser. While, server-side validations take place at the server end using ASP.Net and PHP, and the feedback is sent through a dynamically generated new webpage

Answer:   The user input validation that takes place on the server side during a post back session is called server-side validation. The languages such as ASP.NET use server-side validation.
On the other hand, the user input validation that takes place on the client side is called client-side validation.