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Reference.org
Active protection system
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<p>An active protection system (APS) is a system designed to actively prevent certain anti-tank weapons from destroying a vehicle. </p><p>Countermeasures that either conceal the vehicle from, or disrupt the guidance of an incoming <a href="/facts/Guided_missile/C5VwQClz">guided missile</a> threat are designated soft-kill active protection measures. </p><p>Countermeasures that physically strike an incoming threat to damage or destroy it and thereby limit its ability to penetrate armor are designated hard-kill active protection measures. </p>