Performance testing is crucial to ensure that software and systems behave as intended under real-world conditions. It involves testing scenarios such as application response times, data transfer velocity, memory consumption, and network bandwidth usage to identify potential performance problems. The goal of performance testing is to validate the fundamental features of software, improve optimization, and deliver a positive experience for end-users. Common performance issues include slow load time, bottlenecks, poor response time, and poor scalability. Various types of performance tests, such as front-end, load, stress, scalability, spike, soak, endurance, volume, breakpoint, configuration, isolation, and internet testing, are used to measure different scenarios and components. By identifying performance problems early, developers can make necessary changes, fine-tune, and release software with confidence, ensuring a better user experience.