Whenever a device or computer is connected to internet it is assigned with an unique address which is known as IP Address. A few years back a typical IP address was like this 18.104.22.168. This is a IPv4 and the other IPv6 which looks like this 2001:19f0:8001:4c:s219:2562:e35t:m43m.
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So in above case it is hard to always remember these numeric value of these websites or other websites which we frequently visit. Words are easier to remember so this where the Domain name comes in. All you have to do is fill out the site’s name in Url and DNS will convert this Name into IP Address which your computer can understand. Every time we type a domain name , browser sends a request to DNS which query the location of the server over web and fetch its IP Address where the webpages are stored. Your Web pages are stored on Web server But on which One ? Linux Or Windows ?
To know which one is better in terms of performance and reliability Visit Here.