System cleanup refers to the process of removing unnecessary files and data from a computer or device to improve its performance. This can include deleting temporary files, clearing browser caches, and uninstalling unused applications. Regular system cleanup helps free up storage space and can make the device run faster. Additionally, system cleanup can enhance security by eliminating outdated software and potential vulnerabilities. Tools like disk cleanup utilities and antivirus programs often assist in this process, ensuring that the system remains efficient and protected from threats. Regular maintenance is essential for optimal device functionality.