A doughnut or donut is a type of pastry made from leavened fried dough. It is popular in many countries and is prepared in various forms as a sweet snack that can be homemade or purchased in bakeries, supermarkets, food stalls, and franchised specialty vendors. Doughnut is the traditional spelling, while donut is the simplified version; the terms are used interchangeably.

A cruller is a deep-fried pastry popular in parts of Europe and North America. Regarded as a form of cake doughnut in the latter, it is typically either made of a string of dough that is folded over and twisted twice to create its signature shape, or formed from a rectangle of dough with a cut in the center allowing it to be pulled over and through itself to produce distinctive twists in the sides of the pastry.