Robots.txt Controls Site-Wide Access
This text file tells crawlers which sections of your site they can access. It's the first place search engines check when visiting your site.
Meta Robots Tags Provide Page-Level Instructions
These HTML tags give specific directives for individual pages, controlling indexing and link following. They override robots.txt for more granular control.
X-Robots-Tag Works for Non-HTML Files
This HTTP header directive controls crawling for PDFs, images, and other file types that can't use meta tags.
Noindex Prevents Pages from Appearing in Search
This directive tells search engines not to include a page in their index. The page can still be crawled but won't show in search results.
Nofollow Stops Link Equity Transfer
This instruction tells crawlers not to follow links on a page or not to pass authority through specific links, useful for user-generated content or paid links.
Crawl Budget Management Requires Strategic Implementation
Proper use of these directives helps search engines focus on your most important pages, preventing wasted resources on duplicate or low-value content.
How do robots.txt and meta robots tags differ?
Robots.txt blocks crawling at the site level before crawlers access pages. Meta robots tags control indexing and following after a page is crawled, offering more specific control.
Can I use multiple crawler directives on one page?
Yes, you can combine directives like "noindex, follow" to prevent indexing while still allowing crawlers to follow links. Different directives serve different purposes and work together.
What happens if I block a page in robots.txt and use noindex?
Search engines can't see the noindex tag because robots.txt prevents crawling. This can leave already-indexed pages in search results. Use meta robots tags instead for deindexing.
Should I use crawler directives on all ecommerce filter pages?
Strategic use helps prevent duplicate content issues from faceted navigation. Consider noindex for filter combinations while keeping important category pages crawlable to preserve crawl budget.
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Crawler Traps
Website structures that cause search engine crawlers to get stuck in infinite loops or waste crawl budget on low-value pages. Common traps include infinite calendars, faceted navigation, and session-based URLs.
Indexability
Whether a page meets the technical requirements for search engines to include it in their index. Factors affecting indexability include noindex tags, canonical signals, crawl accessibility, and content quality thresholds.
E-E-A-T
Experience, Expertise, Authoritativeness, and Trustworthiness — Google's quality evaluation framework. E-E-A-T is especially important for YMYL content and serves as a guideline for content that demonstrates real-world experience and credible expertise.
Keyword Cannibalization
When multiple pages on the same website compete for the same keyword, splitting ranking signals and confusing search engines about which page to rank. Resolving cannibalization through consolidation or differentiation can unlock trapped rankings.
Related Glossary Terms
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