If we need to describe a person or thing, we use different adjectives. This can include personality, ethnic background, physical appearance, or other characteristics. Most of these are not unique. For example, when you talk about a 6-foot-tall boy, there can be lots of 6-foot-tall boys in the city. But it still explains that the person that we're trying to describe is definitely not a girl. If we need to uniquely identify a person or thing, we need to identify some unique attributes associated with them. If it's a person, then their passport number, telephone number, or social security number will make it easier to uniquely identify them from others. If it's an object, the unique identifier could be the serial number or barcode.
Within an organization, there are many physical entities. These can be either employees or resources...
