Visitors use your domain name to view your website. When they enter your domain name into a browser or click a link with your domain name, the domain is then translated into your server IP address. At this point, the server sends the visitor your site files and their browser displays your website. Without each of these important elements, you wouldn't have a website.
Computers communicate by using numbers, called IP addresses, to contact each other, similar to how a phone number reaches a specific person. Without a domain name, you'd need to provide an IP address, such as '123.456.789.123/~mysite' instead of using a domain name such as 'mysite.com', making your site appear unprofessional and impractical.
Web hosting is similar to renting office space. It does't include furnishings or products, your web hosting account doesn't include a site for you to sell your products, it provides space to add your website files.
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Site files are what your visitors see when going to your website. The hosting server reads these files, telling the visitors browser how the webpage looks or instructs the server to do a series of computations.