Specifically HTTP/3 and QUIC (which came out of Google):

https://en.wikipedia.org/wiki/HTTP/3

https://en.wikipedia.org/wiki/QUIC

They don't require you to use QUIC to access Google, but it is one of the options. If you use a non-supporting browser (Safari prior to 2023, unless you enabled it), you'd access it with a standard TCP-based HTTP connection.