Dataset consist of DataTable object. The DataTable object contains DataRow object and DataColumn objects. They also contain collection of keys, default values and constraints. Finally, each table contain defaultview.
The DataSet object represents imported or linked data from an application e.g. manually created Pushpins etc. This object is invalidated once the application is closed. Dataset contains another collection known as DataTable object. Each DataTable contains a collection of DataRow objects and each DataRow is a collection of DataColumn objects.
A Data set is a collection of data,it contains a contents of single database table. In the table column represents a particular variable and each row defines to a given number of data sets.