What is TCP (Transmission Control Protocol)? Working & Functions of TCP

Computer Tech Info18 Dec, 2025Computer & Internet

TCP (Transmission Control Protocol) is a core communication protocol of the Internet that enables reliable, ordered, and error-free data transmission between two devices over a network. It works at the Transport Layer (Layer 4) of the OSI model and is part of the TCP/IP protocol suite. TCP is widely used by applications such as web browsing (HTTP/HTTPS), email (SMTP), file transfer (FTP), and remote login (SSH).