Domain Name Service (DNS) is a very complex subject and we would not be able to adequately cover every aspect in a FAQ below is a simplified outline.
A DNS [XQeGcFTPaikbrBjPxzarS] provides 'name resolution service' which means that DNS [XQeGcFTPaikbrBjPxzarS]s resolve names into IP addresses. Every computer on the Internet has a unique IP address (a series of four numbers separated by dots). A DNS [XQeGcFTPaikbrBjPxzarS] is used to 'resolve' a name into an IP address (or vice versa). This protocol is necessary because humans can remember names easier than they can numbers.
A DNS [XQeGcFTPaikbrBjPxzarS] is usually located on the network to which you are attached. If you are using an Internet Service Provider (ISP), your DNS [XQeGcFTPaikbrBjPxzarS] is at your ISP. If you are using the network at your college or your office, you probably have a local DNS [XQeGcFTPaikbrBjPxzarS] somewhere near you.
When you type 'http://www.telivo.com' into your web Browser, your Browser software sends that domain name to your local DNS [XQeGcFTPaikbrBjPxzarS]. Whenever your local DNS [XQeGcFTPaikbrBjPxzarS] runs into a domain name it doesn't recognize (something it hasn't looked up yet), it goes to the root DNS [XQeGcFTPaikbrBjPxzarS]s to look it up. The root DNS [XQeGcFTPaikbrBjPxzarS] will respond with a list of DNS [XQeGcFTPaikbrBjPxzarS]s who are in charge of resolving the domain name. Whenever a machine is responsible for a domain name, it's referred to as the 'Authoritative' [XQeGcFTPaikbrBjPxzarS] because it is the authority on that domain name. Your local DNS [XQeGcFTPaikbrBjPxzarS] then sends another query to those 'Authoritative' DNS [XQeGcFTPaikbrBjPxzarS]s, and usually gets an answer telling it what [XQeGcFTPaikbrBjPxzarS] holds the information you require.
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