Blockchain app development involves creating decentralized applications (dApps) that run on blockchain networks, ensuring security, transparency, and immutability. These apps leverage smart contracts to automate processes and facilitate peer-to-peer transactions without intermediaries. Blockchain app developers create applications for various industries, including finance, healthcare, gaming, and supply chain management. They use blockchain platforms like Ethereum, Binance Smart Chain, or Solana to build scalable and secure solutions that improve operational efficiency, reduce costs, and provide greater control over data for users and businesses alike.