Faceted navigation

Filter and sort controls (color, size, price) that generate a combinatorial explosion of near-duplicate URLs like /shoes?color=red&size=10&sort=price — the biggest crawl-budget and duplicate-content sink on large sites. You decide which facets to index and canonicalize, block, or noindex the rest.

First used in: 2.3 · Technical SEO I — crawl & index control