The BattleTag is a player-created name that serves as your Battle.net title. It is used in all Blizzard games, as well as on their forums and community websites. Players create a name of up to 12 characters, and this becomes their official title on Battle.net. Your BattleTag is what other players see on your Diablo III characters, and what appears on their Friends List.
A digital camera records and stores photographic images in digital form. Many current models are also able to capture sound or video, in addition to still images.
A digital camera takes a photograph by using sensors to capture the light that comes in through the lens. It then converts the light into binary numbers that are recorded on backing storage. This digital version of the photograph can then be displayed on the small screen that is set into the camera.