Cached page
A cached page is the old copy a search engine keeps; even after the source changes, the result's title and snippet can show the old version for a while.
Why it is a problem
An article deleted at source can still appear on Google with its old headline, suggesting it is still online.
How to clear it
Google's Refresh outdated content tool and Bing's content removal tool clear old copies of pages deleted or changed at source; you do not need to own the site.
Frequently asked questions
How long does a cache take to clear by itself?
Days to weeks depending on crawl frequency; the tools speed it up.