Multiplexing and streams

A stream is like a tunnel that has many cars passing through it in both directions, with the cars being substituted with frames, and a stream is standalone between a client and a server. In HTTP/2, a connection can have many streams, with frames from one request spread over many streams, though the order of the frames is important.

This is a significant improvement from HTTP 1.1, which uses multiple connections to render a single page.