What is Bitcoin?

Bitcoin is completely decentralized digital currency. So unlike the current money system and for the first time in history, there isn’t the need for intermediaries or 'middle men'. And unlike the US Dollar, Euro, Yen, etc. Bitcoing is money without borders.
This gives individuals the ability to transfer funds quickly and securely using digital wallets which have both a bitcoin address, which is perfectly fine to share with people, and a private key (which you DON’T share).

 Bitcoin is built on top of the Blockchain which is a decentralized ledger used to keep track of Bitcoin transactions.