CCleaner is a popular system optimization and cleaning tool designed to enhance the performance of computers by removing unnecessary files and fixing issues that can slow down the system. It helps users clear temporary files, browser caches, and junk data that accumulate over time, freeing up storage space and improving overall speed. CCleaner also provides features for managing startup programs, uninstalling software, and cleaning the Windows Registry, which can further optimize system performance. Additionally, it offers privacy protection by clearing browsing histories and cookies. With its user-friendly interface, CCleaner is widely used by both beginners and advanced users to maintain a cleaner, faster, and more secure computer.