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TCP stands for transfer control protocol.
UDP stands for user data gram protocol or universal datagram protocol
As far as TCP is concerned, it is a connection oriented protocol on the other hand, this is not the case with UDP because it is connection-less protocol. Acknowledging the functions, TCP performs its functions very well, as a message it makes its own way across the internet from one computer to another because this is connection based protocol. On the very other hand, UDP is also a protocol used mainly in the message transport or transfer. This is not the connection based which rarely means that it cannot send out the program with loads of packets to another and that would be the end of the relationship.