HTML relationship attributes provide search engines and browsers with additional context about a link.
Use Sponsored for Paid Relationships
The sponsored value is appropriate for advertisements, sponsorships, paid placements, and affiliate links.
Use Nofollow When Endorsement Is Unclear
Nofollow can be useful when you cannot verify or endorse a destination. It may be combined with sponsored or ugc when both descriptions apply.
Keep Attributes Consistent
Apply the same policy across text and image links. Document the rule for authors so commercial content remains consistent.