Performance monitoring tools are software applications designed to track and analyze the performance of systems, applications, or networks. They help identify issues, optimize resource usage, and ensure that services run smoothly. By collecting data on metrics such as response time, uptime, and resource consumption, these tools provide insights that can lead to improved efficiency and reliability. These tools can be used in various environments, including cloud computing, web applications, and IT infrastructure. Popular examples include Nagios, Prometheus, and New Relic. By utilizing these tools, organizations can proactively address performance bottlenecks and enhance user experience.