Blockchain is a distributed ledger technology that enables secure, transparent, and tamper-proof transactions. Blockchain is used in many applications, such as cryptocurrency, supply chain management, and voting systems. Popular blockchain platforms include Bitcoin, Ethereum, and Hyperledger. Learn about Internet of Things (IoT) is a network of interconnected devices, such as sensors, appliances, and vehicles, that can collect and exchange data. IoT is used in many applications, such as smart homes, healthcare, and transportation. Popular IoT platforms include AWS IoT, Microsoft Azure IoT, and Google Cloud IoT.