Facets are a type of search filter that can narrow down search results quickly, offering customers more control over their search experience. Facets can be static or dynamic, changing depending on the context of the search query, and can impact site conversion rates and customer perception. Filters, another type of search tool, are commonly used to narrow down results based on broadly defined categories and do not change between searches. Facets can be created from almost any attribute on a site, including categories, colors, ages, and more, and can take various forms such as checkboxes, tabs, sliders, and tag clouds. Effective facet design is crucial for improving site usability and customer experience, considering desktop and mobile differences in behavior and appearance. By using facets, websites can help users navigate complex collections of content and improve their search experience, ultimately impacting conversion rates and customer satisfaction.