CCleaner is a popular system optimization and privacy tool designed for Windows, macOS, and Android devices. Developed by Piriform, it helps users improve their computer’s performance by removing unnecessary files, temporary data, and broken registry entries. The software also offers tools to manage startup programs, uninstall applications, and securely erase files. CCleaner includes a privacy feature that clears browser history and cookies, helping to protect user data online. The program is user-friendly and offers both free and paid versions, with the professional version providing real-time monitoring and automatic updates. Over time, as computers accumulate junk files and outdated settings, system performance can slow down. CCleaner addresses this by cleaning and optimizing the system, potentially freeing up valuable storage space and improving speed. While it's widely used and trusted, users should exercise caution when using the registry cleaner, as incorrect changes can affect system stability. Overall, CCleaner is a useful tool for routine maintenance.