A Small robots.txt File and the Big Consequences of One Line

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Summary

This article explains how robots.txt works and why a single line can have major effects on search engine crawling and site visibility. It walks through common directives such as Disallow, Allow, Sitemap, and Crawl-delay, and shows how they control access for bots. It also covers related mechanisms like noindex, X-Robots-Tag, canonical tags, and the newer llms.txt concept for AI crawlers. The piece is educational and focuses on best practices for managing indexing and bot access rather than on a specific company or product announcement.

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