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For user is important DNS resolvers, which can be use to resolve DN to ip. You can use DNS from your provider, or free DNS like
GOOGLE DNS SERVERS
Google operates the world’s largest public DNS service. Launched in December 2009, it supports many billions of DNS queries per day
Supports billions of DNS queries per day via its servers.
Security software company Symantec began offering its free Norton DNS in 2010.
Comodo Secure DNS
In addition to its free DNS service, Comodo is known for the Antivirus package it sells along with other software products.
Dial Telecom DNS
Slovak Telecom DNS