What is a URN and why should a business owner care about Uniform Resource Names?
A URN is a unique identifier for naming a particular resource, typically on-line. A URN is a type of URI.
URNs are used to name specific resources, such as technical namespace definitions or particular books or works of art. Though you may come across this term while researching for your new web site, it will probably not be relevant unless you intend to get very involved in the technical aspects of your web site, and even then you probably won't come across it much...