An organization is a group of workspaces, offering a centralized place for managing them and checking their event consumption.
When you're the member of an organization, it's next to the list of workspaces after you sign in to Synerise:
Organizations are only visible to their users. If you need access, contact the person in your company who's responsible for managing the organization and ask them to invite you. Being a user in a workspace does NOT grant access to that workspace's organization. Your level of access to information and options in an organization depends on your membership type, as described in Organization users.