Pidgins—their development, disappearance, or subsequent creolisation—are a fascinating phenomenon in the parts of the world that experienced long-term foreign intrusion and its consequences, one of which was contact between two or more linguistic groups, usually of unequal power. Colonisers did not learn the language of the colonised, who often were perceived as inferior, while the colonised people did not or could not master a foreign language in their own country. In most cases, pidgins were a telltale sign of colonialism. Linguists classify these contact languages, which have no native speakers, into major groups named after the dominant base, such as English-, Portuguese-, Spanish-, Dutch-, French-, or Russian-, as well as African-, Asian-, and Austronesian-based.