A feature dataset in ArcGIS Pro requires what to function correctly?

A feature dataset in ArcGIS Pro is a collection of feature classes that share a common coordinate reference system (CRS). The requirement for a shared CRS is fundamental because it ensures that all the geometries within the feature dataset align correctly in spatial analysis and representation. If feature classes within a feature dataset had different CRSs, it would lead to inconsistencies in location, rendering, and analysis, making it impossible to perform accurate spatial operations.

While unique IDs, multiple shapefiles, and at least one map may be necessary for other aspects of data organization and representation, they do not define the essential functionality of a feature dataset in relation to spatial coherence and integrity. The shared CRS is crucial for maintaining the integrity and usability of the spatial data within the feature dataset.