* Root server: A system that locates name servers that contain authoritative data for the top-level domains.

* Search Engine Optimization (SEO): The process of optimizing a web page for high search engine rankings for a particular search term or set of search terms.
* Second Level Domain: In the Domain Name System (DNS), the next highest level of the hierarchy underneath the top level domains. In a domain name, that portion of the domain name that appears immediately to the left of the top level domain. For example, the DomainMart in DomainMart.com.

* Sponsored Links: Paid advertising which displays next to the natural search results. Customers can click on the ad to visit the advertiser's website. This is how the search engines make their money. Advertisers set their ads up to display whenever someone searches for a word which is related to their product or service. These ads look similar to the natural search results, but are normally labeled "Sponsored Links" , and normally take up a smaller portion of the window. These ads work on a Pay-Per-Click (PPC) basis (i.e. the advertiser only pays when someone clicks on their ad).

* Subdomain: Typically known as a " domain within a domain" , subdomains are individual Web addresses built upon a pre-existing domain name (such as clientname.yourhostingcompany.com). As a reseller, you will have the option of assigning subdomains to clients if they do not choose to have a domain name.

* Third Level Domain: In the Domain Name System (DNS, the next highest level of the hierarchy underneath the second level domains. It is that portion of the domain name that appears two segments to the left of the top level domain. Third level domains are not the portion of an email address that appears in front of the @ symbol - for example, the webmaster in support@DomainMart.com is not a third level domain.

* Top Level Domain (TLD): In the Domain Name System (DNS), the highest level of the hierarchy after the root. In a domain name, that portion of the domain name that appears furthest to the right. For example,the com in DomainMart.com.

* Technical Contact (TechC): When you register a domain name you must specify a technical contact for that domain. This individual will be responsible for any technical issues regarding the domain name. The technical contact may be the same as the billing or administrative contact.

* Top Level Domain (TLD): TLD is the last part of the domain name. For example, the .com in www.mysite.com is the top level domain. ("mysite" would be the second-level domain). In the Domain Name System (DNS), the highest level of the hierarchy above second level domains. Our domain name - DomainersChoice.com - for example is part of the Internet address for Nanjing Imperiosus Technology Co. Ltd. The DomainersChoice part is the second level domain while the .com is the Top Level Domain. Second level domain names are what you register by or on behalf of registrants (or name holders) in a Top Level Domain registry. There are two types of Top Level Domains. The most common type is Generic or gTLDs, such as .COM, .NET, .ORG. New gTLDs such as .NOM, .INFO, or .WEB may be introduced sometime in the near future. The other type of TLD is the ccTLD (country code top level domains) which are assigned to all countries and their dependencies. Every TLD registry - generic or country code - has its own prices, policies, and procedures that registrants (name holders) in that registry are subject to. It is important to know and be prepared to accept these before registering name(s) in a particular registry.