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What is a DNS Cache?
A DNS cache is a temporary database, maintained by a computer's operating system (Windows etc), that contains records of recent visits and attempted visits to web sites and domains.
The internet uses Domain Name System or DNS to index public Web sites and IP addresses. Every time a user visits a web site the user's Browser (Chrome, Firefox, Safari, etc) initiates a request to visit that web site, but this request cannot be completed until the Web site name is converted into an IP address.