The core API library contains the classes, methods, properties, events and type definitions for all the layers, widgets, visualization and client-side analysis functionality.
The @arcgis/charts-components package contains the chart component and the charts action bar component, which can be used to build charts in custom web applications.
The @arcgis/coding-components package currently contains the Arcade editor component, which allows the end user to create Arcade expressions.
The embeddable components contain an embedded map component, which allows users to embed a saved web map with default components (i.e. zoom, legend, bookmarks) pre-configured.