A handler is someone who manages, guides, or takes care of something or someone that requires special attention or expertise. The word appears in several contexts:

A dog handler trains and works with dogs, especially in professional settings like police work, search and rescue, or dog shows. The handler knows how to communicate with the dog, understands its behavior, and helps it perform specific tasks. At a dog show, you'll see handlers guiding dogs through their routines and showing them to their best advantage.

In airports, baggage handlers load and unload luggage from planes. These workers handle (take care of) your suitcase from the moment you check it until it appears on the carousel.

Athletes and performers often have handlers who manage their schedules, deal with the media, and help them navigate busy public appearances. A famous musician's handler might escort them through crowds, arrange interviews, and make sure they get where they need to be on time.