A domain name is a name that allows others on the Internet to find your web site easily. It is -
my.biz something.com, or - something.net and so forth.
Remember, registering your domain name is only the first step of a whole process.
Currently names can be registered up to 67 characters in length including the period (full stop) and extension (.biz .com,.net etc.).
As names can be of any length up to 67 characters you don't have to compromise and choose some shortened version with no connection to the real message you wish to convey. Remember to keep it short which means you should always consider a
.biz domain name which are highly valuable.
For example - bpap.com - when what you really want is - BillsPaintingAndPlastering.com
Remember that some search engines such as Google will give your name greater relevancy during a search if your name contains some or all of the words which someone is searching for.
Also consider how your proposed domain will fit as a title on your web page. It is here that shorter names may be more manageable.
By registering as many variations of your domain names this will protect your interests. Think of the variations which could occur and especially with misspelling - and register them.