iframe is used to render external web pages and documents like PDF & docs.
you can generate HTML iframe with this tool
Where can I use iframe
You can use HTML iframe to display external webpages on your webpage or you can display videos and maps also like YouTube videos and Google Maps of any place.
<iframe src="https://example.com" width="600" height="400"></iframe>
You can use an iframe HTML tag to generate an iframe like the one above.