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TCP/IP and UDP
Both TCP and UDP are protocols used for sending bits of data — known as packets — over the Internet. They both build on top of the Internet protocol. In other words, whether you are sending a packet via TCP or UDP, that packet is sent to an IP address. These packets are treated similarly, as they are forwarded from your computer to intermediary routers and on to the destination.
Great context for the four layer model and TCP/IP
TCP and UDP are not the only protocols that work on top of IP. However, they are the most widely used. The widely used term “TCP/IP” refers to TCP over IP. UDP over IP could just as well be referred to as “UDP/IP”, although this is not a common term.
TCP Explained
Additional Reading
https://www.computerhope.com/jargon/t/tcpip.htm
https://en.wikipedia.org/wiki/Transmission_Control_Protocol
https://www.guru99.com/tcp-ip-model.html
https://www.plixer.com/blog/network-layers-explained/