Probably you have seen CCTV cameras monitoring premises 24/7. CCTV analyses areas to find out threats and hazards in real time. Similarly, predictive maintenance is also about monitoring your in-service asset conditions. However, it is a bit different from monitoring premises.
This process involves monitoring assets to find out about its performance. Based upon this analysis it chalks out a report about the need and urgency of maintenance. Furthermore, for monitoring asset conditions, predictive maintenance relies on IOT devices.
Probably, you got an idea about what predictive maintenance is.