Glass is a wearable computer with a head-mounted display that allows users to access information, take pictures and videos, and stay connected to the internet through voice commands. It has a 640 x 360 resolution display and 5MP camera for taking photos and 720p videos. Developers can create Glassware apps using the Mirror API and GDK to build the user interface and integrate hardware sensors and voice control. The key is to develop apps that are relevant, fun to use, and respect users' privacy.