POSITIVE FEEDBACK

(i) If the feedback signal (voltage or current) is applied in such a way that it is in phase with the input signal and thus increases it,then it is called a positive feedback.

(ii) it is a regenerative or direct feedback.

(iii) Positive feedback increases the gain of amplifier.

(iv) It produces excessive distortion.

(v) Positive feedback is used in oscillators.

NEGATIVE FEEDBACK 

(i) If the feedback signal (voltage or current) is applied in such a way that it is out of phase with the input signal and thus decreases it,then it is called negative feedback.

(ii)It is a degenerative or inverse feedback.

(iii) Negative feedback reduces gain of the amplifier.

(iv) It generates less distortion.

(v) Negative feedback is frequently used in small-signal as well as with large-signal amplifier circuits.