Application monitoring is the process of keeping track of the performance, availability, and overall health of an application. It involves continuously monitoring various metrics such as response time, throughput, error rates, and resource utilization to ensure that the application is running smoothly and meeting the desired performance goals. By monitoring applications, Enforus allows users to proactively identify and resolve any issues or bottlenecks that may arise, enhancing the overall efficiency and reliability of the IT and OT systems.