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The full form of HTTP is Hyper Text Transfer Protocol. And HTTP2 is the second major version of the application protocol in the form of HTTP/2. A protocol is a set of rules that administer the information correspondence systems between customers (for instance Internet browsers utilized by web clients to demand data) and servers (the machines containing the mentioned data). The Hypertext Transfer Protocol (HTTP) is an application convention for dispersed, shared, hypermedia data systems. HTTP is the establishment of information correspondence for the World Wide Web i.e Internet, where hypertext reports incorporate hyperlinks to different assets that the client can without much of a stretch access, for instance by a mouse click or by tapping the screen in an Internet browser. Improvement of HTTP was started by Tim Berners-Lee at CERN in 1989. Advancement of early HTTP Requests for Comments (RFCs) was an organized exertion by the Internet Engineering Task Force (IETF) and the World Wide Web Consortium (W3C), with work later moving to the IETF.
HTTP/1.1 was first archived in RFC 2068 out of 1997. That particular was obsoleted by RFC 2616 of every 1999, which was in like manner supplanted by the RFC 7230 group of RFCs in 2014. HTTP/2 is an increasingly productive articulation of HTTP's semantics "on the wire", and was distributed in 2015; it is currently bolstered by significant web servers and programs over Transport Layer Security (TLS) utilizing an Application-Layer Protocol Negotiation (ALPN) extension[2] where TLS 1.2 or fresher is required.
This are the beginning era of Internet Protocol : HTTP 0.9 --> HTTP 1.0 --> HTTP 1.1 --> SPDY 1.0 --> SPDY 2.0 --> HTTP 2.0 --> HTTP 3.0

HTTP/2 is a major revision of the Hypertext Transfer Protocol (HTTP) used for online communication. It was released in 2015 as a significant upgrade over the previous version, HTTP/1.1, which had been the standard for over 15 years. HTTP/2 aims to improve the speed, efficiency, and security of web communication by addressing some of the limitations of its predecessor.
Here are some key features of HTTP/2:

Multiplexing: This allows multiple requests and responses to be sent over a single connection simultaneously, instead of sequentially as in HTTP/1.1. This significantly reduces the time it takes to load a web page, as multiple resources can be fetched at the same time.
Header compression: HTTP/2 uses a header compression algorithm called HPACK to reduce the size of HTTP headers, which can make up a significant portion of the data transferred between a client and a server. This further improves the speed of communication.
Stream prioritization: HTTP/2 allows clients and servers to prioritize different requests and responses. This is useful for ensuring that critical resources, such as the HTML content of a web page, are loaded first, while less important resources, such as images, can be loaded later.
Server Push: This feature allows servers to proactively send resources to clients that they anticipate needing, even before the client has explicitly requested them. This can further improve the speed of page loading.

Overall, HTTP/2 offers a number of significant benefits over HTTP/1.1, including:

Faster loading times: Websites using HTTP/2 can load up to 2 times faster than those using HTTP/1.1.
Improved responsiveness: Web pages feel more responsive as resources are loaded more efficiently.
Reduced resource usage: HTTP/2 uses less bandwidth and CPU power than HTTP/1.1.
Enhanced security: HTTP/2 is built on top of TLS, which provides strong encryption for communication between clients and servers.

As a result of these benefits, HTTP/2 has become the preferred protocol for web communication. Most major web browsers and servers now support HTTP/2, and its adoption is steadily increasing.

You can test if your Domain uses HTTP/2 or not by our free SEO HTTP2 test Tool. It will inspect and will give you the result if your website can support HTTP/2 or not. You need to contact your Website Hosting provider if your website cannot support HTTP/2 protocol, you need to have the latest Software in order to support HTTP/2, for instance HTTP/2 Support was introduced in IIS 10.0, and your website should be hosted in Windows Server 2016 for HTTP/2 to work.