A domain name in the context of the internet is the words that people type in to access your website. This is something such as http://www.example.com. Choosing a domain name is an important part of any website. It is the first step to an online presence and should be fairly easy to remember.
Your domain name does not need to be the same as your company's actual name. You can choose any word or combination of words that relate to the services that your company offers. In fact, you can own many domain names and doing so is often advantageous for Search Engine Optimization.
.COM, .ORG, and .Net are all examples of Top Level Domain Names. When you are purchasing a domain name, it is usually a good idea to choose one that fits with your organization type. A .COM domain is a good choice for Businesses. A .ORG domain is a good choice for non profits and other organizations. A .NET is a good choice for any type of organization, although it was originally intended for telecommunications companies. No matter which Top Level Domain you choose, it is imperative that you choose a domain that your customers will recognize as synonymous with who you are as an organization.