YAHWEH adopts the successful model SaaS for developing the deploying the software on Cloud. The vast majority of SaaS solutions are based on a multi-tenant architecture. With this model, a single version of the application, with a single configuration (hardware, network, operating system), is used for all customers. To support scalability, the application is installed on multiple machines. In some cases, a second version of the application is set up to offer a select group of customers with access to pre-release versions of the applications for testing purposes. This is contrasted with traditional software, where multiple physical copies of the software each potentially of a different version, with a potentially different configuration, and often customized are installed across various customer sites.

While an exception rather than the norm, some SaaS solutions do not use multi-tenancy, or use other mechanisms such as virtualization to cost-effectively manage a large number of customers in place of multi-tenancy. Whether multi-tenancy is a necessary component for software-as-a-service is a topic of controversy.

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