What is Google push service?

google Push Service, often associated with google Cloud Messaging (GCM) and its successor Firebase Cloud Messaging (FCM), is a messaging service that allows developers to send notifications and messages to devices in real-time. It enables applications to receive updates, alerts, and other information without users needing to manually refresh or check for updates. This service is widely used in mobile apps to enhance user engagement by delivering timely information. FCM supports cross-platform messaging, making it versatile for both Android and iOS applications.