Push notification

A message sent by a server to an application or device without a request initiated at that moment. It can alert a person or update an app in the background.

Apple Push Notification service: Apple’s service routes notifications from providers to Apple devices and apps. It delivers push notifications to Apple platforms.
Notification permission: A user or system authorization that allows an application or website to display notifications. Permission controls whether an app may show alerts to a person.
Mobile marketing: Marketing activity delivered through mobile devices, including app messages and notifications. Businesses use notifications to announce offers and bring users back to apps.
Polling (computer science): A method in which a system repeatedly checks another system for new data or status changes. Polling has the client initiate repeated checks, unlike server-initiated push delivery.
Notification fatigue: Reduced attention or responsiveness caused by receiving too many notifications. Frequent alerts can make people ignore or disable an app’s messages.
Firebase Cloud Messaging: Google’s cross-platform messaging service delivers notifications and data messages to client applications. It provides a common delivery route for Android and other clients.
Publish–subscribe pattern: A messaging pattern in which publishers send messages to topics that subscribers choose to receive. Push systems often distribute updates through subscriptions rather than direct requests.
Breaking news: News reporting about events as they develop, often distributed through immediate alerts. News organizations use push alerts for urgent developments.
Long polling: A communication technique in which a server holds a client request open until data is available or a timeout occurs. It simulates timely updates while each exchange begins with a client request.
Attention economy: An economic model in which human attention is scarce and organizations compete to capture it. Notifications compete for attention by interrupting activity at chosen moments.

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