Core dna is built as a multi-tenant platform. All users of Core dna login from a single login screen. 

A multi-tenant architecture such as Core dna means that all users and applications share a single, common infrastructure and code base that is centrally maintained.

Because Core dna clients are all on the same infrastructure and code base, Core dna can innovate more quickly and save the valuable development time previously spent on maintaining numerous versions of outdated code.

Although SaaS applications such as Core dna DXP are ‘multi-tenanted’, users can easily customize applications to fit their business processes without affecting the common infrastructure.

Because there is a separation between that front-end experience layer and the Core dna DXP platform, clients can create their own interconnections using APIs and plugin to third-party systems.

Additionally, because of the way SaaS is architected, these customizations are unique to each company or user and are always preserved through upgrades. That means SaaS providers can make upgrades more often, with less customer risk and much lower adoption cost.

Core dna digital experience platform (DXP) is a Software as a Service platform. 

Software as a Service (SaaS) is a way of delivering applications over the Internet through a subscription fee model instead of through traditional on-premises, licensed software models of the past.

Instead of installing and maintaining software platforms, software-as-a-service is accessed via the Internet, eliminating complex computing infrastructure provisioning and maintenance tasks.

SaaS applications are sometimes called web-based software, on-demand software, or hosted software. Whatever the name, SaaS applications run on a SaaS provider’s servers. The provider manages access to the application, including security, availability, and performance.

Find more details on Software as a Service here