A Performance Profiler is a tool used in software development to analyze the efficiency of a program. It helps developers identify bottlenecks, memory usage, and CPU consumption, allowing them to optimize their code for better performance. By providing detailed insights into how a program runs, it aids in improving overall application speed and responsiveness. These profilers can be integrated into various programming environments and often support multiple languages, such as Python, Java, and C++. Popular examples include Visual Studio Profiler and gprof. Using a performance profiler can lead to more efficient software, enhancing user experience and resource management.