Tons of discussion and nobody mentioned this: https://en.wikipedia.org/wiki/Reliable_User_Datagram_Protocol https://en.wikipedia.org/wiki/Reliable_User_Datagram

Tons of discussion and nobody mentioned this: https://en.wikipedia.org/wiki/Reliable_User_Datagram_Protocol https://en.wikipedia.org/wiki/Reliable_User_Datagram_Protoco... Reason for using TCP is that using UDP requires application specific implementation and making it good and efficient would require more work than making rest of the software. That's why the applications only use UDP where it really does make difference. Others just won't bother.