A "handler" typically refers to a person who manages or controls something or someone. In various contexts, this can include animal handlers, who train and care for animals, or event handlers, who coordinate activities during events. The role of a handler often requires specific skills and knowledge related to the subject they are managing. In the context of technology, a handler can refer to a piece of code that processes events or data. For example, in programming, an event handler is a function that responds to user actions, such as clicks or key presses. This allows software to react dynamically to user input, enhancing the overall experience.