The term domain name has multiple meanings:
Domain Name System
- a name that is entered into a computer (e.g. as part of a Web site or other URL, or an e-mail address) and then looked up in the global Domain Name System which informs the computer of the IP address(es) with that name.
- the product that registrars provide to their customers.
- a name looked up in the DNS for other purposes.
- They are sometimes colloquially (and incorrectly) referred to by marketers as "Web addresses".
- The authoritative definition is that given in the RFCs that define the DNS.
- Domain names are hostnames that provide more easily memorable names to stand in for numeric IP addresses. They allow for any service to move to a different location in the topology of the Internet (or another internet), which would then have a different IP address.
- Each string of letters, digits and hyphens between the dots is called a label in the parlance of the domain name system (DNS). Valid labels are subject to certain rules, which have relaxed over the course of time. Originally labels must start with a letter, and end with a letter or digit; any intervening characters may be letters, digits, or hyphens.