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.
Much like the smokescreen, the APS gives a tank better protection against ATMs. It's found on higher level tanks. Unlike the smokescreen, Active protection is a passive, constant effect, and isn't 100% effective.Qnomei (talk) 22:59, May 8, 2014 (UTC)