Any buddy tell me what difference between ICommand & Relay Coomand With example

Hi to all,

Any buddy tell me what difference between ICommand  &Relay  Coomand  With example 

Impliment in MVVM Project.

and Why we use this type of command in WPF

Thanks,

aniruddha acharya

A.Acharya Feedback to us Develop and promote your apps in Windows Store Please remember to mark the replies as answers if they help and unmark them if they provide no help.