Below is a list that describes the type of entity that Identity class represents.
individual: A single person.
group: An informal collection of people, without formal governance, such as a distributed hacker group.
system: A computer system, such as a SIEM.
organization: A formal organization of people, with governance, such as a company or country.
class: A class of entities, such as all hospitals, all Europeans, or the Domain Administrators in a system.
unknown: It is unknown whether the classification is an individual, group system, organization, or class.