HTTP/2 or H2 for short is a major revision of the hyper text transfer protocol that improves the performance of the web. It uses a binary protocol and multiplexing.

In this video I want to go through how HTTP/2 works, its pros and cons and show the performance difference between HTTP 1.1 and HTTP/2

Http/1

request has to wait for a response

And if you used up your connection response you can send anything else.