HTTP/2 has become a first-class citizen in the past couple of years where development teams have started realizing its true potential. Some of the core features of HTTP/2 are

• Data compression of HTTP headers
• Server Push
• Multiplexing multiple requests over a single TCP connection

Here is a very good illustration of HTTP/2

While we talk about HTTP/2, it makes sense to touch base upon HTTP/3. HTTP/3 suggests using QUIC protocol instead of TLS for faster communication. Here is a good article on comparing HTTP with HTTP/2 and HTTP/3.