Link structure within the site

An obvious, but sometimes overlooked, aspect of search engine optimization is to make sure that search engine spiders can actually find (crawl) all of the site's pages. If they can't find them, they sure as hell won't get spidered and indexed, and no amount of search engine optimization on them will help.

The term domain name has multiple meanings, all related to the Domain Name System (main article).
• a name that is entered into a computer (e.g. as part of a website or other URL, or an email 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 rememberable 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. Labels must be between 1 and 63 characters long (inclusive). Letters are ASCII A–Z and a–z; domain names are compared case-insensitively. Later it became permissible for labels to commence with a digit (but not for domain names to be entirely numeric), and for labels to contain internal underscores, but support for such domain names is uneven. These are the rules imposed by the way names are looked up ("resolved") by DNS. Some top level domains (see below) impose more rules, such as a longer minimum length, on some labels. Fully qualified names (FQDNs) are sometimes written with a final dot.

Translating numeric addresses to alphabetical ones, domain names allow Internet users to localize and visit websites. Additionally since more than one IP address can be assigned to a domain name, and more than one domain name assigned to an IP address, one server can have multiple roles, and one role can be spread among multiple servers. One IP address can even be assigned to several servers, such as with anycast and hijacked IP space.