 
<translate> Wannan shine bayanin da ya dace: An kafa su ne don yin aiki guda ɗaya ko saitin ayyuka masu alaƙa. Saboda haka, amsar ita ce Gundumomi na Musamman. <eng> This is the relevant information: They are formed to perform a single function or a set of related functions.
Therefore, the answer is Special districts. 