What are Smart Goals (Google Analytics)

I noticed we have many 'Smart Goal' completions (Paid Search, Organic, etc.) within our GA account.
Are those completions not real / fictive?
How does it work exactly?
Also, they can be imported into Google Ads.
Thanks!

It helps you identify the most engaged users on your website and counts their visits as conversions.
Smart Goals are designed to help you optimize your campaigns.It helps you capture more conversions, giving you the ability to make better account decisions and use tools such as automated bidding.