To simplify things, a DataSet contains multiple DataTables.
To compare things to a typical relational database, a DataTable would be
roughly equivalent to a table in a database - whereas a DataSet is in many
ways like a database. A DataSet can define DataRelations - which define the
relationship between DataTables, much like a foreign key relationship can be
set up between tables in a database. DataSets, themselves, contain no data.
DataSets contain DataTables (which is where any data actually resides),
DataRelations, etc, but no data.
If you only need one in-memory "table" - then you can create a DataTable and
use it without also having it reside within a DataSet.
-HTH
