An iframe (short for inline frame) is an HTML element that allows an external webpage to be embedded in an HTML document. Basically it's a website within a website. It allows you to insert a piece of content from another source into a webpage. 

The source code for an iFrame will look similar to this:

<iframe src="http://example.com/blog.html" width="500" height="90"></iframe>

So for example, the popup (outline in orange below) is content being shown from another webpage using an iFrame. Hopefully this makes more sense now :)

What's Next

Now let's learn how to get the Capture url from an iframe.

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