A common use for blockchain technology is in the realm of cryptocurrency, where it underlies digital currencies like Bitcoin and Ethereum. Blockchain serves as a decentralized and distributed ledger that records all transactions across a secure network of computers. This ensures transparency and prevents tampering or fraud since each transaction is immutable and visible to all participants. Beyond cryptocurrencies, blockchain is also applied in supply chain management, digital identity verification, and contract management, allowing for greater trust and efficiency in various industries.