what is avatar and signature for?

what is avatar for and signature? :hmm:

And how do you make them....

Simply putting, avatar is your identity while you signature is, well... your signature. Signature is a bit just for a personality thingy or to show a message in an image or text form.

Avatar:

http://en.wikipedia.org/wiki/Avatar_(computing)


Signature:

http://en.wikipedia.org/wiki/Signature_block