push notification

A push notification appears through a phone, tablet or computer's notification system. It usually contains a short message and can open a particular app or website screen when selected. Users can immediately see a new message, changed appointment or important status update.

How does it reach the device?

A user must first grant an app or website permission to send push notifications. The device then registers with a push service. When the app needs to notify the user, its backendGlossary · In briefbackendThe backend is the part of an application that processes data, applies business rules and communicates with other systems on the server. Users usually access it through a frontend or API.Read more sends a message to the correct device through that service. The app processes the message and displays the notification.

On websites, push messages usually work with a service worker: a script that can become active in the background when a message arrives. A progressive web appGlossary · In briefprogressive web appA progressive web app (PWA) uses modern web technologies to offer an app-like experience. Users can install it from a compatible browser and use additional features supported by their device.Read more can therefore display a notification without the user having the website open. The exact capabilities vary by browser and operating system.

When is a push notification appropriate?

Push notifications are particularly useful when information needs to reach a specific user quickly. Examples include changed appointments, incoming chat messages or tasks that need attention. An in-app message or email is often more suitable for information that is not urgent.

Users can refuse permission or withdraw it later, so the application must remain usable without notifications. A notification should also display only information suitable for a locked screen. Sensitive details are better shown after the app has been opened and unlocked.