Google Search Console (GSC) is a free tool that lets site owners monitor how Google crawls, indexes, and ranks their content. Key reports include Performance (clicks, impressions, average position, and click-through rate for queries and pages), Coverage (which URLs are indexed or excluded and why), Core Web Vitals (field data for Largest Contentful Paint, Interaction to Next Paint, and Cumulative Layout Shift), and the URL Inspection tool (which shows the last crawled version of a specific URL and lets you request indexing). GSC also surfaces manual actions, security issues, and structured data errors. It does not reveal all queries — data is sampled and queries with very few impressions are withheld — but it remains the most authoritative source of crawl and index data available to site owners. Formerly known as Google Webmaster Tools.