Why Burp Suite? Let's cover some groundwork!

Burp Suite is a proxy and it allows you to intercept and tamper each and every request that goes from the browser to the application server. This gives the tester a huge capability to pentest all the avenues of the application, as it shows all the available endpoints. It works as a middleware. The biggest advantage it gives you is the capability to bypass client-side validations. 

It is a smart tool that keeps track of your browsing history and also manages the site structure, giving you a better picture of what is available and what the newly discovered avenues are. The core advantage of Burp is that it allows you to forward HTTP requests to different Burp tools and carry out the required task. It could be repeating or automating an attack, decoding certain parameters, or comparing two or more different requests. Burp gives the user a capability to understand different formats by decoding the parameters at runtime for the user; for example, decoding ViewState parameters, beautifying JSON requests, and so on.