Index Bloat
Index bloat means having far more URLs indexed than you have genuinely valuable pages. It is usually caused by parameters, faceted navigation, tag archives, pagination or internal search results being left crawlable and indexable when they should not have been.
Why it matters for your rankings
Index bloat dilutes site quality assessment and wastes crawl budget simultaneously. Thousands of near-identical filtered URLs give Google a large sample of your site that is thin and repetitive.
It also makes diagnosis harder for everyone. Reports fill with URLs nobody intended to publish, real problems hide among noise, and your indexed page count bears no relationship to the pages you actually care about. The usual sources are predictable: internal search result pages, tag and author archives on WordPress, print views, session parameters and every combination a faceted filter can generate. Each has a standard fix, and the cleanup usually improves crawl coverage of the pages that matter within weeks.
How to check it on your site
Compare indexed count against real pages
Check Search Console's indexed total against the number of pages you deliberately publish.
Find the pattern
Use site: searches with parameter fragments to identify which URL family is generating the bloat.
Noindex the low-value families
Internal search results, thin tag archives and filtered views usually belong out of the index.
Block parameters at the source
Robots.txt rules and canonical tags together stop the URLs being generated and indexed.