Everything is byte. Of course, this won't sound SO strange to most of you. After all, everything which resides on a computer's HD, whether it is a sound, a movie or this plain text file, must be first converted to binary format. This takes us to some less obvious considerations: if everything shares the same format, why do I run some files while I play others? Can I read an executable? Can I listen to an image? The answers are, respectively, because there is something which tells the system what to do; of course you can!