Websites vs Domains
Website is a set of all related web pages, content and other components located on a public domain and hosted on a server. When speaking about websites, one would usually mean the design and the content. When talking about domains, one would usually talk about the URL where you can find the website.
Multiple domains can host the same website. You could have the same webpage on test.website.com and website.com.
Cookie Information solution is compatible with root domain only, also usually referred to as a second/third-level domain.
Cookie Information solution differentiates domains and subdomains. Subdomains are, in other words, unique.
The URL page is a webpage within your website, and it is the same as your root domain.
Based on the example under the subdomains section, you may have your English support centre located on the http://www.example.com/support/en URL page. In the Cookie Information system, it means it belongs to the same domain http://www.example.com.
For that reason, you purchase different scanning depths (500, 5000, 15000) depending on how many URL pages your domain has. It also means you cannot add individual URL pages in the Cookie information platform, only the root domains.