TCP

Transmission Control Protocol (TCP) is a Transport Layer protocol that delivers reliable end-to-end communications between host applications. TCP's characteristics and features include:

• error correction
• flow control
• connection-oriented
• congestion control

It is one of the main protocols in the TCP/IP suite and complements the Internet Protocol (IP). UDP is another prominent Transport Layer protocol that, unlike TCP, is considered connectionless and unreliable.

Links:

https://networklessons.com/cisco/ccna-routing-switching-icnd1-100-105/introduction-to-tcp-and-udp