In Web Hosting, a dedicated server is a single Web server leased to you for the purpose of hosting one or more sites. Depending on your contract with the provider, you may be responsible for administration on the server, or it may be a managed server that requires little maintenance. Dedicated servers are usually located in a datacenter belonging to the hosting company. It is possible to set up your own server with a high-speed line, but this usually costs more than leasing a server. Colocation (hosting your machine at their location) is another option.

A DDoS attack, is a Denial of Service attack, initiated from multiple attack locations. This is usually due to a worm, a calabrative effort between multiple attackers, or a single attacker, attacking from multiple locations on the Internet.

A domain name server, also called a DNS or name server, is a machine that handles name queries for all hosts within a particular domain. The domain name server is the authoritative source for addressing information about hostnames within its domain. What this means is that when another computer needs to know the IP address of a host within that domain, it sends a message to the domain name server for that domain, asking that the host name be resolved and the host's IP address be returned to the machine sending the query. This occurs because all routing and addressing on the Internet happens via IP addresses and not names. Names are used for human convenience and all actual addressing is done based on IP numbers. The domain name system is the name for the worldwide-distributed database that maps all the world's host names to their proper IP address. A domain name server serves hostnames and their IP addressed for a particular domain.

The DNS protocol, refers to the translation of a human readable name like www.LiveHost.net, to a computer friendly IP address like 12.43.110.81. There are many pieces to DNS, and many types of DNS servers involved.

A "Registrar" (or "Domain Name Registrar") is an organization like GotoNames.com that has control over the granting of domains within certain TLDs (top level domains, like the generic .com/.org/.net or country-specific. ca/.us/.mx etc.).

There is a central registry of all domain names on the Internet. For your domain name to become a part of the registry, your domain name needs to be added to that registry.

This is done through a domain registrar, and would make you the domain registrant.

Registering a domain name means you are associated with that domain name for the period of the registration. (1 year, 2 years, etc.) "Registering" a name means you own it, and no one else can register that exact same name. There are exceptions, if determined by the courts that a domain name is a registered trademark of another company, then the domain registrant could be required to surrender the domain.