What is primarily used in Braze for tracking user engagement with apps or sites?

The Braze SDK is primarily designed to track user engagement with apps or websites. It is a software development kit that allows developers to integrate Braze's features directly into their mobile applications or web services. By using the SDK, developers can access a wide range of functionality, such as user analytics, push notifications, in-app messaging, and more, which enables them to monitor how users interact with their app or website in real time.

This tracking capability is essential for understanding user behavior, engagement patterns, and the overall effectiveness of marketing campaigns. The SDK collects detailed data on events, user sessions, and user attributes, which can then be analyzed to optimize marketing strategies and improve user experiences.

The other options provide useful functionalities but serve different purposes. The Braze REST APIs facilitate communication between external systems and Braze's platform, enabling developers to send user data or trigger campaigns, but they do not directly track engagement as intuitively as the SDK does. CSV imports are primarily for bulk data uploads, helping in data migration and initial setup rather than ongoing tracking. Partner integration plugins can enhance functionality by connecting Braze with other tools, but again, they do not primarily focus on user engagement tracking in the same direct manner as the SDK.