Cached Page
A cached page is a saved snapshot of a webpage that a search engine stores in its database after crawling it. When a user conducts a search, the algorithm evaluates these cached versions to determine rankings, not the live version of the site. If a website makes critical updates to its content or technical architecture, those changes will not impact rankings until Google re-crawls the URL and updates its cache. Analyzing the cached version of a page is a fundamental diagnostic step to verify exactly what text, links, and code Google was able to read during its last visit.
Cached Page Simplified
A cached page is a screenshot Google takes of your website when it visits. When Google decides where to rank you, it looks at that screenshot, not your live website. If you make a change today, it won’t help your SEO until Google comes back and takes a new screenshot.