HTTP/2 is a newer version of the HTTP protocol, designed mainly to make web pages load faster. The original HTTP/1.1 could really only handle one request at a time per connection, so a page full of images and scripts had to wait in a queue. HTTP/2 fixes that by sending and receiving many files at once over a single connection.
Imagine a checkout with one till versus a checkout with several lanes open. On HTTP/1.1, every file waits in a single line, and one slow item holds up everyone behind it. On HTTP/2, the files flow through together, so a page with fifty small assets stops being held up by the slowest one. It also compresses the repetitive parts of each HTTP header, which trims away wasted bytes on every request. And it lets the server push along files it knows the browser will need next, instead of waiting to be asked.
For a business owner the practical effect is simple: a snappier site, especially on image-heavy pages and slower mobile connections. You usually do not configure anything yourself. It is enabled at the server or CDN level and kicks in automatically once your site runs over HTTPS. The gains show up most on pages that pull in lots of small files, which is most modern sites, and they help the metrics Google actually measures, like how quickly the main content appears. There is now an even newer version, HTTP/3, that goes a step further on flaky connections, but HTTP/2 is the floor any decent host should already be giving you.
At TopDevs we serve every project over HTTP/2 or newer, so visitors get the fastest possible load without you having to think about the plumbing.
