A domain is the address or name by which a website can be found and accessed on the Internet. A domain consists of a name and a top-level domain, such as ".com", ".org" or ".net". The choice of a suitable domain is of great importance for the success of a website on the Internet. An easy-to-remember and meaningful domain can help users to find the website more easily and remember it better. A domain can also influence the image and credibility of a website.

Domains can either be purchased or rented and must be renewed regularly to remain active. It is important to choose a domain that matches the goals and content of the website and fits well with its purpose and target audience.