A favicon (short for "favorite icon") is a small icon associated with a website that is displayed in browser tabs, bookmarks, browser history, and other places where the site is referenced. It helps users identify websites visually.

Favicon characteristics:

- Small size: Typically 16x16 or 32x32 pixels

- Simple design: Must be recognizable at tiny sizes

- Brand identity: Represents the website or brand

- Multiple formats: ICO, PNG, SVG formats supported

- Universal: Works across browsers and devices

Favicon uses:

- Browser tabs: Identifies open tabs

- Bookmarks: Visual bookmark identifier

- History: Appears in browser history

- Mobile home screens: App icon when saved

- Search results: May appear in some search engines

Favicon best practices:

- Simple design: Works at 16x16 pixels

- High contrast: Visible on light and dark backgrounds

- Brand consistent: Matches website identity

- Multiple sizes: Provide various sizes for different uses

- Modern formats: Use SVG for scalability

Creating favicons:

- Start with a simple, recognizable design

- Test at small sizes

- Ensure it's readable and clear

- Use brand colors

- Consider dark mode compatibility

A well-designed favicon helps users quickly identify your website among many open tabs and bookmarks.