Which term refers to the ability of software to adapt to new user and system requirements?

The term that refers to the ability of software to adapt to new user and system requirements is flexibility. This concept emphasizes the software's capacity to adjust its functionalities, user interfaces, and overall structure in response to evolving needs without requiring extensive rework or a complete overhaul. Flexibility allows developers to implement changes more easily, accommodating new features or adaptations for different environments and user preferences.

While scalability focuses on the software's capacity to handle increased loads or demands without performance degradation, and maintainability relates to how easily software can be updated or repaired, flexibility is specifically about how well the software can adjust to varying requirements over time. Sustainability, on the other hand, often pertains to the long-term viability and environmental impact of software solutions rather than their adaptability. This distinction makes flexibility the correct term in this context.