Auxlang is a short word for "auxiliary language", i.e., a language that is designed and promoted as a bridge language between people of different languages.
There are InternationInternational Auxiliary Languages (IALs) aiminingaiming at the whole world as a target, and Zonal Auxiliary Languages aiming at a group of linguistically or culturally related people.
Examples for international auxiliary languages are Volapük, Esperanto, or Interlingua; examples for zonal languages are Interslavic or Afrihili.