This widget lets you report on the different types of conversions (signups, leads, sales) that are being tracked in your Google Ads account. It lets you report on Conversion Type, Conversion Category, and Conversion Source.
Conversion Type shows conversions that you've defined and named in the Google Ads account.
Conversion Category shows the pre-defined conversion type categories in Google Ads such as purchase, sale, signup, lead, etc.
Conversion Source, as the name states, shows the source from where the conversion was gathered.
This is an example of the results view in the report, where the three segments are included.