Gk bit : Difference between Chaff and Flares:

Both chaff & flares are defensive countermeasures deployed by using navy aircraft. The cause is to confuse radar-guided or infrared-guided anti-plane missiles fired so that they may want to be diverted.

The Chaff is composed of many small aluminium or zinc lined fibres saved on-board the plane in tubes. In case the plane feels threatened by means of any radar monitoring missiles, chaff is ejected into

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the turbulent wake of air at the back of the plane.

Flares on being fired grant an alternate strong IR (Infrared) source to heat-seeking anti-air missiles. Thus they are lured away from the aircraft.