Google Glass is an optical head-mounted display being developed by Google that functions like a smartphone but allows for hands-free interaction. It displays information in front of the user's eye and can respond to voice commands to take photos, videos, give directions, translate text, and more. Some key technologies that enable Google Glass include augmented reality, wearable computing, eye tap technology, 4G connectivity, and an Android operating system. While innovative, concerns exist regarding privacy and potential distractions from surrounding environments.