ringback tone
Definition:
A ringback tone is music that a caller hears when calling your mobile phone. The music replaces the standard ring sound most callers are accustomed to hearing to indicate the call is going through. This is in contrast to a ringtone which is what the person receiving the call hears. Ringback tones can be purchased over the Internet and downloaded to your mobile phone or in some cases, ringback tones can be purchased directly from your mobile phone.
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optical zoom
Optical zoom refers to using your digital camera to zoom in on, or magnify, your subject. The amount you are allowed to zoom is usually indicated by a number followed by an x such as "3x optical zoom" which in this case means the ratio of the longest to shortest focal length on the digital camera lens is 3:1. Optical zooming uses the digital camera's lens to perform the zoom which produces a far superior picture than optical zoom's counterpart, digital zoom.
