My isp or government has blocked access to porn sites but from the same wifi network when I change the dns to Google dns(8.8.8.8) all the blocked sites starts working.
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DNS is like a phone book – you use it to look up the IP address of a webserver when all you have is the url.
So if you want to go to www.reddit.com, you ask your DNS provider to give you the IP address of the reddit.com server, and use that address to connect (all in the background).
Most folks use DNS provided by their ISP – which means that the ISP can simply refuse to give you the IP address of specific sites. Changing the DNS means querrying a different server, which can give you results you would not otherwise get.
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