Performance profilers are tools used to analyze the efficiency of software applications. They help developers identify bottlenecks in code execution, memory usage, and resource allocation. By providing detailed insights into how an application runs, performance profilers enable developers to optimize their code for better speed and responsiveness. These tools can track various metrics, such as CPU usage, memory consumption, and function call frequency. Popular performance profilers include gprof, Visual Studio Profiler, and Java Mission Control. By using these tools, developers can enhance the overall performance of their applications, leading to improved user experiences.