A favicon (favorite icon) is a small brand icon displayed in browser address bars, tab headers, bookmarks, and mobile home screen shortcuts.

HTML5 Head Favicon Declaration Tags

index.htmlhtml
<!-- Standard legacy ICO fallback -->
<link rel="icon" href="/favicon.ico" sizes="any">
 
<!-- SVG responsive icon for modern browsers -->
<link rel="icon" href="/icon.svg" type="image/svg+xml">
 
<!-- Apple Touch Icon for iOS devices -->
<link rel="apple-touch-icon" href="/apple-touch-icon.png">
 
<!-- Web App Manifest for Progressive Web Apps -->
<link rel="manifest" href="/site.webmanifest">