What do you mean by active filter? State its advantages over passive filter . Define pass band & stop band with respect to filter.
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Active Filter: Active Filter is formed by using active element along with the passive components. 

Advantages of Active filter over Passive filter:  High value of pass band gain can be obtained.  It is very easy to select cut-off frequency.  They will not produce loading effect because the output impedance is low.  They are not using inductor so designing of Active filter is simple, cost is less & they occupy less space. 

Pass Band Filter: The frequency range which is permitted to pass is known as pass band. 

Stop Band Filter: The frequency range which is attenuated is known as stop band.
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