When you open a Unity ID account, you are automatically assigned an organization. This default organization gets the same name as your user name and consists only of yourself. You can make purchases for this organization for your own personal and commercial development.
You can also create an organization on behalf of a company. You can make purchases for your company via its Unity ID organization. You can invite others to join the organization and tailor their access level to Unity based on their role within the organization.
An example of an organization with its members and groups.
The latest feature we added to Unity ID is Groups, which helps customers to more easily manage their teams. An owner or manager of a company’s Unity ID organization can put members of the organization into a group, and give that group access to a specific Unity project.