Blockchain is a distributed ledger technology that allows for secure, transparent, and tamper-proof transactions. Blockchain is used in many applications, such as cryptocurrency, supply chain management, and identity verification. Popular blockchain platforms include Ethereum, Bitcoin, and Hyperledger Fabric. Go to site Natural user interfaces (NUIs) are interfaces that allow humans to interact with computers using natural actions and gestures, such as touch, voice, and body movement. NUIs are used in many applications, such as virtual assistants, gaming, and education. Popular NUI platforms include Microsoft Kinect, Apple Siri, and Amazon Alexa.