The Multi Tenant (SaaS) deployment environment refers to the SaaS dbt Cloud application hosted by Fishtown Analytics. This is the most commonly used deployment and is completely managed and maintained by Fishtown Analytics, the makers of dbt. As a SaaS product, a user can quickly create an account and get started using the product. The deployment is hosted in AWS and will always contain the latest software updates and bug fixes.
For more information about the dbt Cloud Production deployment see the below.