People Also Viewed A collaborative recommendation that surfaces products other shoppers viewed alongside the item currently being viewed. Often displayed as "customers who viewed this also viewed" widgets on product pages. Definition Definition People Also Viewed works off collective behavior, not fixed rules. If thousands of shoppers who view product A also frequently view product B, that co-viewing pattern is treated as an implicit signal that the two products are related, even if nothing in the catalog data connects them directly. That's the key difference from rule-based cross-selling, where a merchandiser manually decides "show product B next to product A." People Also Viewed is emergent: it comes entirely from aggregate shopper behavior, not a decision anyone made about which products belong together. Technically, the system logs pairs of products viewed in the same session, tracks how often each pair co-occurs, and ranks the results by that co-occurrence frequency. It's a form of item-based collaborative filtering, the same family of technique behind "customers who bought this also bought." It differs from Frequently Bought Together in what it measures: viewing behavior versus purchase behavior. Someone might view a $2,000 laptop and a $15 mouse in the same session without ever buying the laptop, so a "people also viewed" pairing can surface relationships a purchase-based one would miss, including price-comparison behavior between similar items. What it's used for What it's used for It keeps shoppers on-site when the product they landed on isn't quite right. Instead of bouncing back to search or leaving the store entirely, they see a set of alternatives other shoppers considered in the same situation, which increases time on site and pages per session, both of which correlate with higher conversion likelihood. It's especially useful on product pages where the current item might not close the sale on its own, either because of price, stock, or fit, since the shopper gets a path forward without having to reformulate a search. How Doofinder applies it Doofinder Recommendations includes People Also Viewed as one of the built-in carousel logics available for product pages. It can be filtered further by category, price range, or other catalog attributes, and store owners can set a fallback so the carousel always shows a minimum number of products even for lower-traffic items without much co-view data yet. Example Case study Example An electronics store adds a People Also Viewed carousel to its laptop product pages. On a mid-range laptop's page, the carousel starts surfacing a specific laptop bag and a wireless mouse, neither of which the store had manually linked as accessories. The pattern comes purely from shoppers who viewed the laptop also frequently viewing those two items in the same session. Click-through on that carousel outperforms the store's manually curated "accessories" section on the same pages, since it reflects what shoppers are actually comparing rather than what the merchandising team assumed they'd want. References Sources https://doofinder.com/en/blog/ecommerce-product-recommendations