The difference and relation between TCP and UDP

contact ：

All work at the transport layer , Their job is to transfer data between programs

difference ：

        TCP：

                         Based on connections , By three handshakes , Transfer confirmation , Wave four times to establish a connection , In order to ensure a reliable connection on an unreliable network .

The transmission data is stable and reliable , It is suitable for scenarios that require high network quality , It needs to be transmitted to the other party accurately , Such as transferring files , Send mail, etc .

        UDP:

                         Based on unconnected , Sending data is to simply encapsulate the data packet , Then send it out from the network card , There is no state connection between packets .

Fast transmission speed , However, packet loss may occur , Therefore, it is applicable and has high requirements for real-time , There is no requirement for a small amount of packets to be lost , Like voice calls , Live video , Tunnel network, etc