Bitcoin allows for instant, nearly free money transfers globally without intermediaries. It uses an open-source, decentralized network secured by cryptography. Growth in bitcoin users, transactions, merchants, and price has been exponential. Valuing bitcoin based on replacing remittances, online gambling, or Amazon transaction fees could value each bitcoin from $2,000 to $42,000, though current market size values it around $350. The bitcoin ecosystem is growing rapidly with startups, VC investment, ATMs, mobile apps, and integration into traditional banking and finance.