Here’s the explainer from How-to-Geek: What is the Difference Between TCP and UDP?
UDP stands for User Datagram Protocol — a datagram is the same thing as a packet of information. The UDP protocol works similarly to TCP, but it throws all the error-checking stuff out. All the back-and-forth communication and deliverability guarantees slow things down.
When using UDP, packets are just sent to the recipient. The sender won’t wait to make sure the recipient received the packet — it will just continue sending the next packets. If you’re the recipient and you miss some UDP packets, too bad — you can’t ask for those packets again. There’s no guarantee you’re getting all the packets and there’s no way to ask for a packet again if you miss it, but losing all this overhead means the computers can communicate more quickly.
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