A shapefile stores nontopological geometry and attribute information for the
spatial features in a data set. The geometry for a feature is stored as a
shape comprising a set of vector coordinates.
Because shapefiles do not have the processing overhead of a topological data
structure, they have advantages over other data sources, such as faster
drawing speed and edit ability. Shapefiles handle single features that
overlap or that are noncontiguous. They also typically require less disk
space and are easier to read and write. ArcView uses shapefiles just as it
uses coverages - as a data source for a feature theme. The rest of the software
functionality is identical for both shapefiles and coverages.
Shapefiles support data editing functions in ArcView. Shapefiles
can support point, line, and area features. Area features are represented as
closed loop, double-digitized polygons. Attributes are held in a dBASE
format file. Each attribute record has a one-to-one relationship with the
associated shape record.