Which of the following best describes OutSystems?

OutSystems is best described as a low-code platform for rapid application development. This characterization reflects its core purpose and functionality, as it allows developers to create applications through a visual interface with minimal hand-coding. The emphasis on low-code means that users can focus more on design and logic than on extensive programming, significantly speeding up the development process.

The platform supports both web and mobile applications, facilitating a faster delivery cycle, which is highly beneficial for businesses that need to adapt quickly to changing market requirements. With its built-in features for integration, user interface design, and deployment, OutSystems empowers developers to efficiently create high-quality applications while reducing the complexity associated with traditional software development.

Other answers, such as the notion of OutSystems being an open-source development framework or a traditional coding environment, do not accurately convey the nature and primary aim of the platform. The emphasis on being a low-code platform highlights its distinguishing capabilities in the modern software development landscape.