A pidgin is a simplified language that develops as a means of communication between two or more groups that do not have a language in common, in situations such as trade. Pidgins are not the native language of any speech community, but are instead learned as second languages. Pidgins usually have low prestige with respect to other languages.
Not all simplified or "broken" forms of language are pidgins. Pidgins have their own norms of usage which must be learned to speak the pidgin well.