What is Faceted navigation?

The arithmetic

Filters multiply rather than add. A category with filters for size, colour, brand and price, each with five values, produces over six hundred combinations before pagination and sort order are considered. Almost none of them are things anyone searched for.

How to handle it

• Canonicalise filtered views to the clean category URL by default
• Give a facet a real, static, indexable URL only where it has genuine search demand — "waterproof walking boots" might; "boots sorted by price descending" does not
• Never make sort order an indexable variant
• Do not link to combinations you do not want crawled
• Use robots.txt disallow deliberately rather than as a first response, because it strands already-indexed URLs

The commercial upside people miss

A handful of facet combinations usually have real demand and no dedicated competitor page. Promoting those few to proper landing pages with their own copy is one of the highest-return moves available in e-commerce SEO.

Where this is covered in depth

A definition can only go so far. The e-commerce SEO checklist, in the order the checks actually matter covers this properly — 3 minutes, free, no email required.

Who wrote this

Anas Bin Masud builds e-commerce sites and does technical SEO for businesses in the UK, Canada and Pakistan. These definitions come from client work rather than from a content brief — where an entry describes a mistake, it is usually one found on a real site. More about how I work.