TCP（传输控制协议）是一种面向连接的、可靠的传输层协议。TCP协议在网络层IP协议的基础上，向应用层用户进程提供可靠的、全双工的数据传输流。-TCP (Transmission Control Protocol) is a connection-oriented, reliable transport layer protocol. TCP protocol in the network layer IP protocol based on the user process to the application layer to provide a reliable, full-duplex data transmission stream.