TCP, or Transmission Control Protocol, is a fundamental communication protocol used on the internet. It ensures that data sent from one computer to another arrives accurately and in the correct order. By breaking down large messages into smaller packets, TCP manages the transmission process, checking for errors and requesting retransmission if necessary. This reliability makes it essential for applications like web browsing and email. In addition to its error-checking capabilities, TCP establishes a connection between devices before data transfer begins. This connection-oriented approach allows for a smooth exchange of information, making it a key component of the Internet Protocol Suite, which powers most online activities today.