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Google caches web pages on its server to increase search speed, usually it copies these from a remote server on the Internet. When you do a search using Google, it accesses their cache to get a quick snapshot of web pages that are relevant to your search term.
In this sense, it is a hit counter for your web page. Search engines use Google cache information to determine how often and when your web page changes. They also use it to evaluate your site's content and value. To increase visits to your site, you should make updates frequently.
Use this Google Cache Checker to see if your web pages are in Google's search index.
Try also Google Index checker and Google Malware Checker.