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

Connected architecture: In connected model we can connect any application to database and stays connected to the database system even when it is not using any database operations. For this architecture, we use Connection, Command and DataReader.

Disconnected architecture: In disconnected model we connect any application to database until we call the close method. In this architecture we use DataSet and DataAdapter.