What is exactly meaning of disconnected and connected approach in ADO.NET

Question

I am learning ADO.Net. I read this line:-

DataReader is \"connected\" approach and dataset is \"disconnected\" approach

From this

Answer 1

In classic ADO the RecordSet object could work both in connected and disconnected mode. In Ado.Net there are two separate types available to cater to each of these scenarios - IDataReader and DataSet

Connected Mode: remains connected to the underlying data source while traversing in a forward-only streams of result sets.

Disconnected Mode: the resultset retrieved is kept in memory and the connection to the DB is no longer needed for traversal.

This MSDN article further compares the two objects and discusses their individual merits a lot better than I will be able to explain here.