Why is blockchain important because it offers a decentralized, secure, and transparent way of handling data and transactions. It eliminates the need for intermediaries, reducing costs and inefficiencies. Its decentralized nature ensures that no single party controls the data, increasing trust and accountability. Blockchain is crucial for industries such as finance, supply chain, and healthcare, where transparency and security are critical. Additionally, blockchain enables innovations like cryptocurrencies, smart contracts, and decentralized finance (DeFi), contributing to digital transformation across sectors.