What are some real-world examples of smart contracts in use today?

Smart contracts are self-executing programs on blockchains like Ethereum that automatically enforce agreements without intermediaries. Real-world examples include: Uniswap, a decentralized exchange where smart contracts automatically swap tokens based on price formulas; Aave, a lending platform where contracts manage deposits and loans, calculating interest rates automatically; MakerDAO, which creates stablecoins by locking cryptocurrency as collateral through smart contracts; and insurance protocols like Nexus Mutual that automatically pay claims when conditions are met. Other examples include NFT marketplaces like OpenSea, where contracts handle ownership transfers and payments, and gaming platforms where contracts manage in-game assets and rewards. These eliminate the need for banks, brokers, or lawyers, reducing costs and processing times while increasing transparency since all transactions are recorded on the blockchain.