TCP stream vs UDP message

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The interface/API presented to you the user(programmer) of these protocols are:

UDP

Message oriented, you have an API (send/recv and similar) that provide you with the ability to send
one datagram, and receive one datagram. 1 send() call results in 1 datagram sent, and 1 recv() call will recieve exactly 1 datagram.

TCP

Stream oriented, you have an API (send/recv and similar) that gives you the ability to send or receive a byte stream. There is no preservation of message boundaries, TCP can bundle up data from many send() calls into one segment, or it could break down data from one send() call into many segments – but that’s transparent to applications sitting on top of TCP, and recv() just gives you back data, with no relation to how many send() calls produced the data you get back.

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