Ionic framework

'ionic' is not recognized as an internal or external command

'ionic' is not recognized as an internal or external command, someone asked me to explain?
I have already installed ionic CLI, But I m getting the following error "ionic' is not recognized as an internal or external command operable program or batch file" 
To resolve this, set the environment variable path:
C:\Users\XXXXX\AppData\Roaming\npm
VIDEO GUIDE: 
This video helps how to set Environment variable Path.

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