Banki wurine na gudanar da hada-hadar kuɗi, da ajeye wa, da bayar da bashi ko juyasu acikin kasuwanci domin samun riba. Banki yana da matukar muhimmanci a al'umma, saboda haka ne kowane kasashe ke bashi tsaro da tsari na musamman. http://www.prarulebook.co.uk/rulebook/Glossary/Rulebook/0/03-09-2015/B