Application Performance Monitoring (APM) refers to the practice of monitoring and analyzing the performance of software applications to ensure they are running smoothly, efficiently, and in line with user expectations. APM tools and practices help businesses and developers identify bottlenecks, diagnose issues, and optimize application performance for a better user experience. It involves tracking various metrics, collecting data, and generating insights about how an application behaves in real-world scenarios. APM covers a wide range of aspects related to application performance.