The Curriculum Framework Builder was introduced in Elentra ME 1.24. Its primary use is to configure curriculum tags that can be used on assessment forms and reported on via learner and program dashboards as part of Elentra's Competency-Based Education tools.
While curriculum tags added via the framework builder and its resulting organization and course trees do become accessible for tagging in other parts of Elentra (e.g. Courses, Events, etc.), not all functionality using Elentra's existing curriculum mapping tools is supported using CBE tags.
Additional details about using the Curriculum Framework Builder to support Competency-Based Education can be found here.