Final answer:
Active faults are those that have moved recently or are likely to move in the future, while passive faults are not currently moving.
Step-by-step explanation:
Faults that have moved recently or are likely to move in the future are referred to as active faults. These faults experience ongoing tectonic activity and can cause earthquakes when they slip. On the other hand, passive faults are not currently moving and do not pose a significant seismic hazard.