Everything you do in Immerok Cloud happens within the context of an Organization (Org). They represent a tenant in Immerok Cloud and you would usually set up exactly one Org for your company.
Currently, there is a 1:1 relationship between users and Orgs. In practice, an Org is created automatically for you during sign up. You can neither create additional Orgs nor can you invite other users to join your Org. Both of these limitations will be lifted in the future.