Every Gloriads blog article tagged Retargeting.

Amazon Sponsored Display targets pages or people, never keywords: products and categories, remarketing and Amazon audiences, or Amazon's own choice.

Amazon Sponsored Display retargeting shows your ad to shoppers who viewed (up to 90 days) or bought (up to 365 days) products you pick, on and off Amazon.

Amazon Sponsored Display, now called Display, shows your products to shoppers on and off Amazon by interest or product page, paid per click or per view.
Gloriads runs your Amazon Ads by rules you control, on all four ad types.