What is \r in linux?

Hello,
I'm sure ALOT of you will laugh but this is really bugging me. I'm in college and we are using Wireshark. Going through a FTP connection and just about every other line has \r or \r\n in it. What are these for? I've found alot of lists that have the commands, but don't explain these. Can anyone tell me a good place t find out?
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  1. \r is "carriage return" and \n is "new line". Think of them as end-of-line markers in a text file. In a binary file (a program, a music file, a picture, etc. they are just numbers).
  2. Ok, that makes sense. So I just need to pay more attention to the command lists and not those. Thanks for your relpy.
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