Basically, a Q-point of any device gives information about the operating current & voltage of that particular device..This would help us to know about the max. & min. current or voltage upto which the can be operated safely.
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Usually, the operating point of a transistor shift because of temperature induced gain or bias changes.
Q point is also called operating point.Q point is mainly adjusted in transistors to make it stable. i.e., to operate the transistor in safe mode. Depending up on the operating current and voltage Q point is adjusted. The Q point defines the operating condition of the transistor and the transistors which quiescent point is adjusted are denoted as Q1,Q2.........Qn
Q point which is quiscent (silent) point is the operating point of a transistor where the variations of collector current and collector-emitter voltage take place when signal is applied.
An unbiased transistor is one being used with no bias voltage to offset its operating point. If the input signal is very small it still can operate as an amplifier but the output will be non-linear. One use for an unbiased transistor is when the transistor is used as a switch, turning it on or off.
The active region of a transistor is when the transistor has sufficient base current to turn the transistor on and for a larger current to flow from emitter to collector. This is the region where the transistor is on and fully operating.