Why is blockchain important because it provides a decentralized, transparent, and secure way to store and transfer data. It removes the need for intermediaries, reducing costs and inefficiencies. With its tamper-proof nature, blockchain ensures that data cannot be altered once it is recorded, making it ideal for applications requiring trust and accountability. Its impact extends beyond cryptocurrencies, revolutionizing industries like finance, supply chain management, healthcare, and voting systems. By enabling peer-to-peer transactions without a central authority, blockchain promotes greater efficiency, security, and innovation in a digital economy.