Allows prograrnimer to branch logic liow depending on specific casess Could also be rewitten as a series of iflelse satements. Performs a set of instructions whale a cond tion is true it possibly will not run the set of Instructions if the condition is fake. Like the While fogp, but it will nun its related set of instructions at leasit f time. even if the condielan it tests is fake Performs a set of indtructions winle a condition is trie, beit has as buile in iteration Warlable and a step functorn that manipulates the iteration yanhible with every loap. Controf structure that allows we to tate branching topes to perform one set of ntivetions if a condinion is trueand cotionaly angthes set of in truition if the condididis inet erue