QUIC runs over UDP, and provides streams and encryption. HTTP/3 is designed to take advantage of QUIC streams (replacing HTTP/2 streams which were problematic d

QUIC runs over UDP, and provides streams and encryption. HTTP/3 is designed to take advantage of QUIC streams (replacing HTTP/2 streams which were problematic due to TCP head of line blocking). The RFCs are a bit elaborate so folks interested might want to look at this instead[1], which has one of the RFC authors explaining the basics of QUIC and HTTP/3. [1] https://www.youtube.com/watch?v=cdb7M37o9sU https://www.youtube.com/watch?v=cdb7M37o9sU