Somehow we do not go rulim. I'm sending your data electric mail, without there UDP. A TCP - this is not an antibiotic? Apparently, we're talking about different things. Poraskinte brain: post message - it's just text only. How do you think he came to the recipients? Well, what about this, I once again up to date: SMTP, POP3, IMAP, and a couple of other abbreviations. It was they conjure with sending and receiving mail. Well, of course, but they just add a few lines of meta-information about your letters. And what messages are finding their way online? ...
TCP? Already warmer. TCP and UDP? Hot! Simply put, your message is wrapped in SMTP (so-called "application layer" because it contains information for postal applications), then the TCP or UDP (the so-called "transport layer", because transfers from point A to point B). Technically speaking, all these data are then wrapped in another one layer, Internet Protocol, or simply IP, called "internet-level", he is responsible for actual delivery of messages to a global communication channels.

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