The Robots Exclusion Checker is a Chrome extension designed for SEO professionals and digital marketers. It provides a visual indication of whether a webpage is being blocked from being crawled or indexed by search engines through robots.txt, meta robots, x-robots-tag, and canonical tags. The extension also checks for UGC, sponsored, and nofollow attribute values. It allows users to choose simulated user-agents for different search engines and is useful for faceted navigation review, detecting crawl or indexation issues, and general SEO review and auditing. The extension eliminates the need for multiple SEO extensions, making it a valuable tool for optimizing websites.