Blockchain is a decentralized digital ledger technology. Data is transparently and securely recorded in blocks, and these blocks are cryptographically chained. Transactions are verified by users on the network and are impossible to change. Cryptocurrencies are used in areas such as smart contracts, supply chain management and secure voting. It offers safe, transparent and intermediary-free transactions. Blockchain also reduces transaction costs and eliminates the need for intermediaries. In particular, platforms such as Ethereum enable automated transactions with smart contracts. This technology; It has the potential to revolutionize many sectors such as finance, health, education and logistics. It is seen as one of the technologies of the future with its decentralization and security advantages.