Bitcoin is a decentralized digital currency that allows people to send and receive money over the internet without the need for a central authority like a bank. It was created in 2009 by an unknown person (or group) using the name Satoshi Nakamoto. Bitcoin transactions are recorded on a public ledger called the blockchain, and the system is secured using cryptography. There is a limited supply of 21 million bitcoins, making it scarce like gold, and it's often called "digital gold" because of that.
