The term "stamped addressed envelope" refers to an envelope that comes with a postage stamp and has a printed address of the sender. Some other terms that can be used interchangeably for "stamped addressed envelope" are self-addressed stamped envelope (SASE), addressed stamped envelope (ASE), and post-paid envelope. These synonyms are commonly used in different parts of the world, and they all have the same purpose- to make it easier for recipients to send a reply or return something to the sender. No matter what term is used, these envelopes remain a practical, convenient, and reliable method for correspondence and mailings.