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This is part of the developer getting started guide.

The official Kubernetes glossary also explains Kubernetes-specific terminology.

Dashboard / Cluster Explorer / Vue UIThe application in this repository. It will slowly replace the older Ember UI
Manager / Cluster Manager / Ember UIThe old Ember based UI
NormanOld Rancher API which has mostly been superseded by Steve
SteveNew Rancher API
Rancher (Product)A Kubernetes Management Platform. This product includes the Rancher API and UIs
RKERancher Kubernetes Engine - A certified Kubernetes distribution
SSRServer Side Rendering. Disabled by default when developing the Dashboard (enabled pre 2.6.6)
SPASingle Page Application. Enabled by default in production
VueA frontend client framework used by the Dashboard
VuexFrontend state management
NuxtVue framework helper