A computer icon is a small graphical representation used on a computer screen to symbolize a program, file, or function. Icons help users quickly identify and access different applications or documents without needing to read text. They are typically designed to be visually intuitive, making it easier for users to navigate their operating system. Icons can be found on various platforms, including Windows, macOS, and Linux. Each operating system has its own style of icons, but they generally serve the same purpose. Users can click on these icons to open programs or files, enhancing the overall user experience and efficiency.