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'''Anti-particlesAntiparticles''' are small units of [[anti-matter]].

===About Anti-particlesAntiparticles===: Many [[Subatomic Particle|particle]]s of [[matter]] have '''anti-particle''' [[antimatter]] counterparts which have the same [[mass]] but opposite [[Electrical Charge|electrical charge]].: During [[Pair-Production|pair-production]] a [[Subatomic Particle|particle]] and its [[anti-particle]] '''antiparticle''' appear.: When a [[Subatomic Particle|particle]] meets its [[anti-particle]] '''antiparticle''' they [[Annihilation|annihilate]] one another producing a pair of [[photon]]s.: Most '''anti-particlesantiparticles''' are given the name of its their counterpart [[Subatomic Particle|particle]] with the addition of the prefix '''anti'''. However, the '''anti-particleantiparticle''' counterpart of the [[electron]] is known as the [[positron]].