A technique that allows the user to explore information by applying multiple filters. Each facet corresponds to a property of the information, and you can specify a specific value or range of a facet to filter on. In class, we learned the flight search site Kayak had faceted browsing, in which you could refine the view of possible flights by take-off times, airline, number of stops, etc. Typically interacting with faceted browsing has immediate feedback in which the filtered information is shown with minimal delay.
This website contains a list of other websites or products that incorporate a faceted browsing design: http://www.smileycat.com/design_elements/faceted_navigation/. One example showcased is Airbnb, which allows you to filter listings by cost, amenities, etc.