👉 A clicker is a device that a person uses to signal their approval or rejection of an action, such as a request for help, a task, or a command. It is typically used in human assistance systems where users can communicate with machines through visual feedback. Clickers are often used by therapists and caregivers, but they can also be used in other contexts like education, security, and even in the workplace to signal whether an action has been completed successfully or not.