Foreground sync is a feature that allows certain apps on Android devices to maintain real-time connections with their servers, providing real-time updates to the user. It refers to the process by which certain apps, once opened and running in the "foreground" of your device, maintain connections and sync data in real-time, rather than waiting until youre not using the device or when the app is running in the "background". Foreground sync is a service feature primarily used in Android operating systems, which allows applications to execute some processes or maintain connections while theyre active and in the "foreground" of the device. It plays a vital role in many types of applications, from instant messaging and email clients to music streaming and GPS navigation systems.

Foreground sync is different from background sync, which is when an app syncs data when its not in the foreground being used by the user. Foreground sync is enabled by default on most Android devices, but it can be disabled under notification settings. Disabling foreground sync under notifications does not disable the foreground sync operating settings, but it disables notifications every time any foreground activity takes place.