Which tool is commonly used for integrating AEM with third-party applications?

Adobe I/O is a powerful tool designed to facilitate the integration of Adobe Experience Manager (AEM) with third-party applications. It enables developers and business practitioners to leverage the capabilities of Adobe’s cloud services, allowing for streamlined connectivity and interaction between AEM and other applications or APIs.

The primary reason Adobe I/O is the correct answer is that it provides a set of APIs and services intended for developers to create integrations that utilize Adobe's offerings effectively. With Adobe I/O, users can manage their integrations and access various Adobe services, making it a robust solution for connecting AEM to external systems.

In addition, Adobe I/O offers features like event-driven architecture and serverless functions, which enhance its capabilities further, allowing for real-time data exchange and operational efficiencies. This highlights the tool's flexibility and adaptability when working with various applications.

The other options do not serve the same primary function. The API Connector, while associated with integration tasks, is not specifically named as a standard tool in AEM's toolkit for this purpose. Content Sync Manager is primarily concerned with content synchronization functionalities within AEM, not broadly for third-party integrations. The Third-party Integrations Console is not an established tool associated with AEM and would be less recognized within Adobe's ecosystem.