The term "video game" has evolved over the decades from a purely technical definition to a general concept defining a new class of interactive entertainment. Technically, for a product to be a video game, there must be a video signal transmitted to a cathode ray tube (CRT) that creates a rasterized image on a screen. This definition would preclude early computer games that outputted results to a printer or teletype rather than a display, any game rendered on a vector-scan monitor, any game played on a modern high definition display, and most handheld game systems. From a technical standpoint, these would more properly be called "electronic games" or "computer games