What is the use of Interface <T>?

Question

Hi,

    I have the below code in my interface. I don't know the exact use of  <T> used in interface. And also please explain each terms in the code.

public interface IIntreface<T> : IDisposable

{ 

IEnumerable<T> GetList(Object Object);

T GetItem(Object Object);

Int32 Save(Object Object);

}

 

 

Thanks