A category of the product, service, event, or issue that an ad concerns. Marketers must correctly choose their Facebook Ad Categories in the Ads Manager if they run Special Ads. This is a necessary step to comply with Facebook’s Advertising Policies. There are certain rules for Special ad categories adopted by Facebook to enable healthy discourse and increase transparency.
Special Ad categories include:
- Social issues, elections, politics;
- Credit opportunity;
- Employment opportunity;
- Housing opportunity or Related Service.
Also, depending on the country, there may be some government regulations. Check this Facebook Business article for more information on Special Ad Categories.