The DNS records translate your domain name (which is a human-readable piece of English text, generally) into numerical IP addresses which uniquely point to the server which store the files that are supposed to e associated with your domain. Thus it is crucial to setup your domain settings so that they know where to point to, so that your website’s files are properly synchronized with your domain name.
The DNS settings usually involve updating your nameservers so that your domain is pointing at the right place. This means that you need to know where your domain needs to point to, to begin with. Finding out your nameservers is easy: just check with your web host, with whom you are going to be hosting your website. This may be the same as your domain name provider, or possibly you got your domains from a company like GoDaddy which is different from your hosting provider. In either case, you can contact their support, or check your email for a “welcome mail” that you receive when you register a domain - you should be able to locate a couple of addresses which will look like four numbers separated by dots. Sometimes there are more than a couple, in which case you should simply make a note of all of them.
The control panel associated with the company that provides your domain name will certainly have a location where you can edit the name server settings, presumably along with a domain manager. The domain manager lets you edit the settings on a per domain basis. So go to the domain that you want to point at your current web host and edit the name server settings. Simply enter your DNS records as suggested by your hosting provider. Give it around 48 hours to synchronize these settings and then your website will be accessible from the domain name that you associated with it!
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