How do search engines treat content inside an IFrame?

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Search engines generally treat iframe content as separate from the main page, not as part of your page's core content.

Content inside an <iframe> is usually indexed under the original source URL, so it gives little to no SEO value to your page.
It also won't significantly help your rankings, internal linking, or keyword relevance—so important content should always be placed directly in your page HTML, not inside an iframe.