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Robots.txt is a standard text file placed in a website's root directory that gives instructions to web crawlers and bots about which pages or sections they can or cannot access. It's a set of rules for search engine indexing.

The robots.txt file must be placed at the root of your website: https://example.com/robots.txt. It must be accessible via HTTP and not via JavaScript or other redirects.

No — robots.txt is an honor system. Well-behaved bots (Google, Bing, etc.) respect it, but malicious scrapers can ignore it. Never rely on robots.txt for security; use authentication or blocking at the server level for private content.

Use Google Search Console's robots.txt Tester tool, Bing's Robots.txt Validator, or online validators to check syntax and see how Googlebot interprets your rules before deploying.

Include specific user-agents like Googlebot and Bingbot for targeted rules, then use * for all other bots. Most websites start with Googlebot rules, then Bingbot, then a wildcard for universal rules.

Crawl-delay specifies the minimum number of seconds a crawler should wait between requests. Use it to prevent server overload, but be aware that Google ignores this directive and uses its own crawl rate management.

No! Modern search engines need access to CSS and JavaScript to properly render and understand your pages. Blocking these files can negatively impact your rankings and indexing quality.

Disallow prevents crawling but doesn't guarantee removal from search results. Noindex meta tags prevent indexing. Use Disallow for private content and Noindex for pages you don't want in search results.

Review your robots.txt whenever you make significant site changes, add new sections, or notice crawling issues in your analytics. Regular monitoring ensures optimal crawler access and indexing performance.