Banana peel

A banana with peel partly removed (partially "peeled"). The peel is the yellow outer "skin".
Discarded banana peels

A banana peel, called banana skin in British English, is the outer covering of a banana. Banana peels are used as food for animals, an ingredient in cooking, in water purification, for manufacturing of several biochemical products as well as for jokes and comical situations.

A banana peel on the ground.

There are several methods to remove a peel from a banana.