app: Short for application, or a computer program designed for a specific task.
avatar: (in virtual reality) An electronic rendering of some image. It becomes the virtual form of some character (even a computer or game user) that will be moved and manipulated by a computer user. It can interact with its environment and other characters.
behavior: The way something, often a person or other organism, acts towards others, or conducts itself.
binge: To do or consume something to excess — usually an unhealthy excess.
cell: The smallest structural and functional unit of an organism. Typically too small to see with the unaided eye, it consists of a watery fluid surrounded by a membrane or wall. Depending on their size, animals are made of anywhere from thousands to trillions of cells. Most organisms, such as yeasts, molds, bacteria and some algae, are composed of only one cell.