Why create web-based scripts/frameworks?

A web framework is a collection of scripts, hosted on a web platform such as Internet Information Services (IIS) (on Windows) or Apache (on Linux), and calling the same script using front-end web-based languages such as HTML.

There are times when people ask why we want to migrate our current scripts or create scripts on a web framework. The answer is very simple. A web framework ensures that our scripts are used by multiple end users using just the browser. This gives the programmer the independence to code the script on their preferred platform (such as Windows or Linux), and people can use the scripts on their choice of browser. They don't need to understand how you have written the code, or what you are calling or using in the back-end, and of course, this ensures that you prevent your code from being directly visible to end users. 

Let's say  you have written a script that calls four or five libraries for specific tasks. There are general libraries...