Bitcoin (BTC) is the world's first decentralized digital currency, operating on a peer-to-peer network without any central bank or single administrator. Introduced in 2009 by an anonymous creator named Satoshi Nakamoto, it relies on a public ledger called the blockchain to secure transactions.

Key features include:
Scarcity: The total supply is hard-capped at 21 million coins.
Security: Transactions are verified by network nodes through cryptography.
Utility: It serves as both a digital payment system and a store of value, often referred to as "digital gold."
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