In computer programming, a "handler" is a routine or function that is designed to process a specific type of input or event. Handlers are commonly used in event-driven programming to respond to user actions, system events, or data received from external sources. They provide a mechanism for intercepting and managing these occurrences, allowing a program to perform appropriate actions based on the type of event that has occurred. Examples include event handlers in GUI frameworks (like button clicks), exception handlers (to catch and deal with errors), and signal handlers (in operating systems).
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