Can someone explain Clojure Transducers to me in Simple terms?

Transducers are recipes of what to do with a sequence of data without knowledge of what the underlying sequence is (how to do it). It can be any seq, async channel or maybe observable. They are composable and polymorphic. The benefit is, you don't have to implement all standard combinators every time a new data source is added. Again and again. As a result, you as user are able to reuse those reci