Bitcoin is the first and most popular cryptocurrency, created in 2009 by Satoshi Nakamoto. It allows people to send money anywhere in the world without using a bank. Bitcoin is limited to 21 million coins, making it rare like gold. Many people call it โdigital goldโ because it can protect against inflation. It runs on a secure, decentralized system called blockchain. In 2025, more companies and countries are accepting Bitcoin, and investors see it as a smart long-term choice. As the world moves toward digital finance, Bitcoin is leading the way as a trusted and powerful financial tool.