What are Events and Listeners in Laravel?

1. Event

• An Event is a signal that “something happened” in your application.
• It’s like a message that announces an action occurred.
• Examples:
  • UserRegistered
  • OrderPlaced
  • PaymentProcessed

Events themselves usually just carry data about what happened (like which user registered).

2. Listener

• A Listener is a class that “listens” for a specific event and reacts to it.
• It contains the code that runs when the event happens.
• Listeners are where you put the logic to handle side effects, like:
  • Sending welcome emails
  • Logging actions
  • Updating statistics

How They Work Together

1. Your app triggers an event when something important happens.
2. Laravel automatically runs all listeners registered for that event.
3. Each listener does its job independently.

Why Use Events & Listeners?

• Decoupling: Keeps your code clean by separating core logic from side effects.
• Extensibility: Add new reactions just by creating new listeners — no need to change core logic.
• Asynchronous processing: Listeners can run in queues to avoid slowing down user experience.