An uninstaller is a software tool designed to remove applications from a computer or device. It helps users delete programs that are no longer needed, freeing up storage space and improving system performance. Uninstallers can also remove associated files and settings, ensuring a clean removal. Most operating systems, like Windows and macOS, come with built-in uninstallers. Users can access these tools through the control panel or application folder. Additionally, third-party uninstallers may offer advanced features, such as batch removal and leftover file cleaning, providing a more thorough uninstallation process.