Thanks to you both.

So wow. Quite literally everything is a file that contains streams of bytes. The file is a notation, or container for bytes, for us to make sense out of the streams right?

Ah and that link that you sent, of wiki talking about streams, is what confused me. The picture they use gave me the impression that stdin is merely for taking in information from the terminal. As if it were special somehow. But as has been said everything is a file. This includes the terminal itself I presume.