Feature Class Types
For attribute tables (features without geometry).
For centroids. A special point associated with a polygon that is defined by line strings. A centroid is surrounded by the features of a line string feature class that builds the polygon.
Examples: parcels, land use.
For features with any geometry (lines, point, or polygon). Normally, a feature class contains features of only one geometry type. In a collection feature class, you can store features with different geometry, which means that you can store point features, line features, and so on in one single feature class.
For polylines. A group of two line string feature classes.
For areas. Built as a group of a line string and a polygon feature class.
For dimensioning. Consists of related tables: Dimension feature class <name>, line string feature class <name>_L, label feature class <name>_TBL with line string <name>_HL and point feature class <name>_P.
For text. Is related to a parent feature class and therefor can only be created from feature class level.
For (closed) polygons. Consists of arcs as well as lines or polylines.