DropBox

Dropbox is web page where users can share files with other users across the internet.
If you have a large document instead of send it with hotmail or gmail, you can use Dropbox, basically because if you want to send it by mail you'll have to wait a lot of time.
It's very useful because you save your documents in your Dropbox account and you can enter there with any computer. If you save a document  in on computer and you want it as well in another, you have to use a pendrive.
I have an account of dropbox:

Go to Dropbox