A quasiparticle that forms from an electronic charge carrier interacting with a solid's vibrating displaceable atoms. In particular, a polaron comprises an electronic charge carrier together with the carrier-induced altered motions of surrounding atoms. Different classes of material have distinct types of polarons. Polarons may be divided into weak-coupling polarons and strong-coupling polarons. Strong-coupling polarons comprise large self-trapped polarons and small self-trapped polarons.