UDP is not included in TCP/IP. Maybe that's what people mean when they shorthand say TCP/IP. But technically UDP is an alternative to TCP and also builds on top of IP.

kilianbuhn

"TCP/IP" is a suite which includes UDP and these TCP-like protocols implemented in user space are encapsulated with UDP. So it's technically still correct, though it's not as snappy of a saying if you have to add "but actually"...

bitcoin

New HTTP/3 Standard Removes TCP from the Internet Stack

nullcount

"TCP/IP" is a suite which includes UDP and these TCP-like protocols implemented in user space are encapsulated with UDP. So it's technically still correct, though it's not as snappy of a saying if you have to add "but actually"...

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