The differences are explained below:

Typed Dataset : The typed dataset is derived from the Dataset class and has an associated XML schema, which is created at the time of the creation of the dataset. In the XML schema contains information about the dataset structure such as tables, columns, and rows. The data is transferred from a database into a dataset and from the dataset to another component in the XML format. 

Untyped Dataset : The Untyped dataset doesn’t have an XML schema associated with it. Untyped Dataset, the tables, and columns are represented as a collection.