FCM (Firebase Cloud Messaging)

Firebase Cloud Messaging (FCM) is a service that allows developers to send notifications and data messages to users' devices, such as smartphones or tablets, in real-time. It helps keep apps engaging by delivering updates, alerts, or information automatically, even when the app isn't open. Think of it as a messaging system that pushes important messages directly to users, ensuring timely communication without requiring them to check manually. FCM is reliable, scalable, and free, making it a popular choice for apps needing to stay connected with their users efficiently.