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The signal-slot mechanism is one of the distinctive features of the Qt framework, allowing applications to be highly responsive by reacting to user actions and monitoring various events within the application. When a user interacts with a UI element, specific tasks often need to be executed in response. For example, when the user clicks the “Submit” button on a form, the expected behavior is for the form data to be processed and possibly sent to a server. This requires a system capable of tracking events and triggering corresponding actions, which in Qt is elegantly handled through signals and slots.

**Signals** : A signal is emitted when a particular event occurs. In the context of a button, for example, a signal is emitted when the button is clicked. Signals do not have any return value, and they can be connected to multiple slots (functions) that will be executed when the signal is emitted.
**Slots** : A slot is a function that is called in response to a particular signal. Slots can be used for any regular function, but they have a special connection to signals. In Qt, slots can have parameters that match the parameters emitted by the signal, and multiple signals can be connected to a single slot.