DNS caching

The practice of storing a DNS (glossary)DNS Domain Name System The internet's directory that links domain names to computer addresses. Full definition of DNS answer for a while so it does not have to be looked up again. Resolvers (glossary)resolver The DNS server that looks up domain names on behalf of users. Full definition of resolver, operating systems and browsers all do it. Each record's TTL (glossary)TTL Time to Live How long resolvers may keep a saved copy of a DNS record. Full definition of TTL says how long it may be kept, which is why DNS changes are not seen everywhere at once.