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HTTP2 is much faster and more reliable than HTTP1. HTTP1 loads a single request for every TCP connection, while HTTP2 avoids network delay by using multiplexing. HTTP is a network delay sensitive protocol in the sense that if there is less network delay, then the page loads faster.
The primary advantage of HTTP/2 is its improved speed over HTTP/1.1. This is achieved thanks to a combination of elements: HTTP/2 is binary, instead of textual meaning it is more compact, travels faster 'on the wire' and is less susceptible to errors. HTTP/2 is fully multiplexed.
It doesn't mean backwards supported - it just means it is not a breaking change and HTTP/1.1 browsers can still connect and continue to use HTTP/1.1 without any change. HTTP/2 has a number of way to detect if it supported by browser and server and only use it if both do, and continue to use HTTP/1.1 if they don't.
HTTP 1.1 is the latest version of Hypertext Transfer Protocol (HTTP), the World Wide Web application protocol that runs on top of the Internet's TCP/IP suite of protocols. HTTP 1.1 provides faster delivery of Web pages than the original HTTP and reduces Web traffic.
HTTP/2 supports queries multiplexing, headers compression, priority and more intelligent packet streaming management. This results in reduced latency and accelerates content download on modern web pages.
More details here.
HTTP 2.0 is a binary protocol that multiplexes numerous streams going over a single (normally TLS-encrypted) TCP connection.
The contents of each stream are HTTP 1.1 requests and responses, just encoded and packed up differently. HTTP2 adds a number of features to manage the streams, but leaves old semantics untouched.
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