Answer
A web app manifest is a JSON file describing an installable web app. • It can set the app name, icons, colors, start URL, and display mode. • The page links to it from `<head>`. • It is an important part of many PWAs.
💡 Simple Example
<link rel="manifest" href="/manifest.webmanifest">
⚡ Quick Revision
A web app manifest tells the browser how an installed web app should look and start.