An active protection system is a system (usually for a military application) designed to prevent anti-armor line-of-sight weapons from acquiring and/or destroying a target.
Electronic countermeasures that alter the electromagnetic, acoustic or other signature(s) of a target thereby altering the tracking and sensing behavior of an incoming threat (e.g., guided missile) are designated softkill measures.
Measures that physically counterattack an incoming threat thereby destroying/altering its payload/warhead in such a way that the intended effect on the target is severely impeded are designated hardkill measures.
Read more about Active Protection System: Softkill Measures, Hardkill Measures
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