This document explores the concepts of filters and faceted navigation and their differences in helping users narrow down large sets of content. It highlights the advantages and challenges of using faceted navigation and provides examples of how it can improve the user experience. The document emphasizes the need to carefully consider whether faceted navigation is necessary before investing resources in its implementation. The author, Kathryn Whitenton, is an expert in user experience and information architecture and has extensive experience in conducting usability research and evaluating websites.