This got skipped over ... but since you asked ...
Real-time traffic, including online games, VoIP, videoconferencing,
relies
heavily on UDP, if only to avoid TCP head-of-line blocking.
Huh? Head of line blocking?
TCP provides a reliable, stream-oriented service - so if you drop a packet,
none of the packets that follow the dropped packet can be delivered to the
application until the dropped packet is retransmitted and received. So, the
sequence number gap blocks all subsequent delivery until that happens.
Spencer
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