What’s the difference between QUIC and HTTP/3?

QUIC was originally a Google effort to improve HTTP/2 by transporting it encrypted over UDP (as opposed to TCP). In 2016, the Internet Engineering Task Force (IETF) began working to standardize the protocol. Part of that process involved splitting QUIC into the transport and application protocols. For some time, the application protocol was referred to as HTTP-over-QUIC, but in November of 2018, the IETF announced that HTTP-over-QUIC would be called HTTP/3.