Bitcoin is simply a digital currency. The reason we believe (and many others) that such an amazing innovation is that digital money is not controlled by any central authority. The Bitcoin network is completely decentralized, the currency itself is produced by a community in which everyone can freely enter. Bitcoin can be transferred almost freely and instantly in contrast to a bank transfer, where someone has to pay a significant amount of money and the completion can take days.
Bitcoin is not like the traditional money we know: it is digitally produced and stored. It is created by a computer network that uses a certain software that solves math problems. There will be a finite number of Bitcoins that can be mined, so inflation is not a problem for this coin.
An online payment with Bitcoin is fast, secure and as anonymous as you want, and the number of products and services that can be paid with digital coins is also constantly growing.