It’s important when you are buying a domain name to get a brief overview of the industry you make part of. One of the most important things to remember is the difference between a domain name and web hosting. A Domain Name is a text name for example: Siteweb.md which provides a more rememberable name to stand in for a numeric IP address. To be more explained, it's known the fact that for contact each other, computers communicate by using numbers, called IP addresses, like when people use a phone number to call a specific person. Domain names on the internet are similar to entries in a phone book. The phone book tells people looking for a business what the entries are just as a domain tells people  that a domain is hosted on the server.

Without a domain, you would have to tell your customers that your site is located at a temporary url such as 234.567.789.123/~siteweb instead of using a domain name such as siteweb.md, making your site appear not so professional and non-practical.

But Web hosting means :

The web-hosting is similar with the space that you rent to have your business placed in. It's actually the space itself. It does not include furniture like where you can place  your products, just as the web-hosting account doesn't include a site for you to sell your products.

Fortunately, in the web-hosting world, it's very easy to furnish the space provided by your host, because you can install many applications. Without the hosting services, you won't have a place for your files to dwell, so your domain would then become like a disconnected phone number in the phone directory, and your site information would have nowhere to stay. You could register a domain name today, but it doesn’t mean there will be a visible website
when you go to that domain name.

Web hosting is the place, on a server, where you store all the text, images, videos and other information that helps creating your website. Domains are the Internet indicators that show web browsers where to find that information. The two can be totally independent or completely interconnected. Regularly, a Website needs a domain name and web hosting. When someone types in the domain name, the website data is located and displays it to the
user. Without the domain, the user would find it difficult to locate the data and without the web hosting, there would be no website to display! From the moment when you have your website working by using web hosting, you can choose as many domain names as you want to that one website. The .md .com, .net, .org, or any other Top Level Domains can be picked up to one web host.