PCMark is a benchmarking tool designed to evaluate the performance of personal computers. It measures how well a system can handle various tasks, such as web browsing, video conferencing, and gaming. By running a series of tests, PCMark provides a score that reflects the overall performance of the hardware and software. The tool is widely used by manufacturers, reviewers, and consumers to compare different systems. PCMark helps users understand how their devices will perform in real-world scenarios, making it easier to choose the right computer for their needs.