DNS is Domain Name system. When you try to access some website it first change domain name into ip addresses then give you reply back. You can check your ISP (Internet Service Provider) From your Router. You can also use Google Public DNS IP addresses.
Google Public DNS IPV4 addresses :-
Google Public DNS IPV6 addresses :-
How to change the IP address :-
1. Go to Control Panel
2. Click Network and Internet > Network Sharing and Center > Change adapter settings
3. Select the network you want to configure Ethernet and Wireless
4. Double click Wireless Network > IPV4 Properties and Use Following DNS
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