TCP/IP :is a suite of protocols used by devices to communicate over the Internet and most local networks , TCP provides apps a way to deliver (and receive) an ordered and error-checked stream of information packets over the network. ,, TCP is all about reliability TCP achieves this in two ways. First, it orders packets by numbering them. Second, it error-checks by having the recipient send a response back to the sender saying that it has received the message (UDP) is used by apps to deliver a faster stream of information by doing away with error-checking. The UDP protocol works similarly to TCP, but it throws out all the error-checking stuff. All the back-and-forth communication introduce latency, slowing things down. UDP is frequently used for live broadcasts and online games.