They are folders and sub folders helping to organize the monitored environments
Use organizations to identify different companies/entities (customer A, B, etc…)
Use groups to identify a common aspect of your environments (like roles: Production, etc…)
Groups will also reflect to a zone where all underlying systems will be reachable.
Each group must be associated to a remote collector which will have the capacity to connect to the systems.
Organization and groups will be later used to set user authorizations and control visibility and actions upon underlying environments
So it is important to consider the future user authorizations when defining your organizations & groups, because environements within the same group will have the same authorizations
At least one organization and one group must exist in your configuration.