The technology that allows users to generate and trade digital currencies is blockchain. Blockchain is a decentralized and distributed ledger technology that enables secure transactions across networks without the need for intermediaries. It underpins cryptocurrencies such as Bitcoin and Ethereum, facilitating transparency and security in financial exchanges. By recording all transactions in an immutable ledger, blockchain ensures trust and integrity within the financial ecosystem, paving the way for innovation in various sectors beyond just currency trading, including supply chain and smart contracts.