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Single-tenancy is an architecture in which a single instance of a software application and supporting infrastructure serves one customer. In the software-as-a-service (SaaS) delivery model, a customer is called a tenant.
In a single-tenancy architecture, the tenant purchases their own copy of the software and the software can be customized to meet the specific and needs of that customer. Single-tenancy can be contrasted with multi-tenancy, an architecture in which a single instance of a software application serves multiple customers.