Each Bitcoin is a computer file which is stored as a digital wallet in smartphones or computer and functions similar to any e-wallet app. Bitcoins use his currency in a digitalized form which has its limits of production and limited to 21 million Bitcoins only. You can send Bitcoins to your digital wallet and then can send Bitcoins to other people. Every single bitcoin transaction is recorded in a public ledger called the blockchain. The blockchain makes it possible to trace the history of Bitcoins to stop people from spending bitcoins they do not own. It also restricts to make copies or undoing transactions.