Entry Action

Entry action refers to a specific activity or set of activities that automatically occur when a system, process, or state is entered. Essentially, it's the task that is performed immediately upon entering a new state to prepare or initialize it. For example, in a traffic light system, when switching to the green light state, an entry action might be turning on the green light indicator. This concept helps organize system behavior by clearly defining what should happen right at the moment a state begins, ensuring consistent and predictable operation.