Introduction to ICO Icons

ICO is a graphics file format used by the Microsoft Windows operating system, specifically designed for storing icon images. As a format optimized for icons, ICO files can present high-quality visual effects and are widely used in the Windows operating system for applications, folders, shortcuts, and more, serving as their dedicated icons.

The most well-known use of the ICO format is as a website's Favicon (Favorites icon). When users visit a website, browsers typically display the site's Favicon in the address bar, tabs, bookmarks bar, and bookmarks, making it an important part of the website's brand identity. Compared to common formats like JPG or PNG, the ICO format offers better compatibility on the Windows platform and web browsers, ensuring the icon remains clear and visible across various display contexts (such as desktop shortcuts, window title bars, and browser tabs).

In short, ICO is an indispensable standard icon format in Windows platforms and web design, serving as a key element in defining the visual identity of applications or websites.