What is the purpose of push notification services?

The purpose of push notification services is primarily to deliver messages from a server to clients without requiring explicit requests from users. This service allows applications to proactively inform users about updates, alerts, or new content that they may find interesting or useful, enhancing user engagement. Push notifications can be used to communicate a variety of information, such as breaking news, reminders for events, or updates about a user's messages.

In contrast, other choices focus on different aspects of user interaction or application functions. Sending data or messages explicitly requested by users aligns more with pull notification services, where users request information rather than receiving it without solicitation. Enhancing the performance of applications relates to application optimization rather than communication. Similarly, providing real-time data backups is focused on data protection and recovery, not on the delivery of notifications. Push notifications serve a distinct role in keeping users informed and connected with minimal effort on their part.