What is the primary function of "Integration Studio" in OutSystems?

The primary function of "Integration Studio" in OutSystems is to manage integrations with external systems. This tool provides developers with the capability to connect the OutSystems platform to various third-party services and data sources, enabling seamless data exchange and interaction with external systems. By allowing developers to define how OutSystems applications communicate with services like REST APIs, SOAP web services, and databases, Integration Studio plays a crucial role in extending the functionality of applications and ensuring that they can leverage external data as needed.

The other choices relate to different aspects of application development within the OutSystems ecosystem. For instance, creating mobile app designs pertains to the Service Studio, which is focused on building user interfaces and user experience. Testing application performance is more aligned with other tools or methodologies in the development lifecycle rather than Integration Studio. Storing user data securely speaks to the overall security architecture and methods used within the platform but is not the main function of Integration Studio.