TCP stands for Transmission Control Protocol. It is sometimes refered to as TCP/IP. TCP is like a messenger, but it delivers messages through the internet. The World Wide Web itself and many E-mail programs use TCP. We will be using a TCP connection to send information between our client and the server.
TCP connections make sure that the data gets to were it needs to go. A UDP(User Datagram Protocol) connection is faster but you will not be sure that the data went through. TCP is designed to always get to the destination but not always so fast.
TCP exchanges pieces of data over the internet called 'packets'. Packets are just the information you are sending.
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