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The transfer of all data on the Internet between devices occurs through special "transport" protocols. Protocols process and deliver information (messages, photos, videos, etc) from one computer to another. The most popular transport layer protocols are TCP and UDP.
They both perform their task but differ in reliability and principle of operation. Let's see how they differ and which protocol to choose.
TCP is a transport channel that must be connected to all parties to transfer data. Only in a such way can it deliver information from point A to point B.
UDP is a protocol that works without establishing a connection with the parties. This is a simplified version of data transfer, without delivery guarantees.
Although TCP outperforms UDP in reliability and transmission guarantees, both of these protocols are actively used by developers. It all depends on what you need the transport protocol for.
TCP is used for programs based on the transfer of messages and files: instant messengers, email applications, file hosting, and storage.
The UDP protocol is used for programs and web resources that broadcast audio or video files in real-time: online games, Internet TV, or video call programs. That is why sometimes the quality of sound and video deteriorates if the connection is lost during a conversation on the network.