Any currency or commodity has perceived value, because people gives it value. Why do people want to use a little piece of paper to buy a cup of imported coffee from a coffee shop? Why does the coffee shop vendor want that piece of paper? The simple reason is that people believe that the piece of paper are backed by the government and the government guarantee it's value.

In Bitcoin people can use the token to transfer value globally, because the token has a perceived value that are determined by supply and demand on a open market. ^smile^