Previously, HTTP/1.1 was the major version of HTTP network protocol used by the World Wide Web, implemented across clients and servers. That worked well for 15 years. But as modern day applications and websites evolved and the amount of data to be loaded on a single page increased, the shortcomings of HTTP/1.1, became more prominent.
The relatively new HTTP/2 protocol speeds up page load significantly and is widely supported by all major browsers and servers. Here is the detailed comparison between HTTP/2 and HTTP/1. Check out.