I really don't understand what Twitter is...
Mitch
It's basically like the status update on Facebook, except that's it. It's known as a micro-blogging site so, 140 characters or less. You can also sign-up for the SMS part of Twitter and update right from your phone and even post pictures about what you saw or what you're doing.
And if you have an iPhone there is specific App's to use Twitter from (Twiterrific is one of them).
It's a cool way to update people on what you're doing, little snippets at a time.
-RA69