Bitcoins can be stored on any device in a 'purse file', or kept safe by a third person who offers the service of storing these types of files. In any case, you can send Bitcoins to any other user that has a Bitcoin address, thus being able to pay for or buy anything from him.
But, several users are probably asking themselves, what does this virtual and futuristic currency work for? Well, to buy real things of course. There is an ever increasing number of businesses that let you pay directly in Bitcoins, they include videogames, music, software, t-shirts, etc. The complete list can be found on their website.
Plus, the software's interface is very simple and clean. You'll have different tabs on hand for sending and receiving coins, transactions, and for the address book.
Bitcoin is a tool that is currently not in widespread use and that sounds pretty strange to most users, but who knows; it could possibly become one of the most important currencies in the near future. The foundations have been laid and the economic rules established, do you want to participate?