Dropbox

Dropbox is a web that uses cloud storage to enable users to store and share files and folders with others across the Internet using file synchronization. 
There are two tipes of accounts: the free account and the paid account are identical in all aspects except for the amount of storage space offered. Providing the free account to users costs a lot of money to Dropbox but nevertheless Dropbox continues to provide the free accounts because it benefits Dropbox in several ways.

We can access it from this address: http://www.dropbox.com/