Q
QUIC = Quick UDP Internet Connections
UDP
based transport protocol meant to improve performance over TCP
defined by
RFC 9000
supported by all current (2023) major browsers, and enabled by default in all except Safari,
making over 50% of all traffic entering Google (source: Wikipedia)
The use of HTTP/2 over QUIC instead of TCP is called HTTP/3, per
RFC 9114
Also usable for
DNS
, per
RFC 9250
. It is then sometimes called DoQ.
The acronym is how it was originally proposed by Google, but the
IETF
does not use it as such, but just as the protocol name