"End-user" is the widely accepted term, but a lot of scientific papers use "casual-user".

Is there any difference between them?

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    "Casual user" is a user who is not highly skilled/motivated with regard to the application in question. – Hot Licks Jan 25 '16 at 3:45

I would assume that end-user includes all users of a completed product, while casual user implies that the user does not utilize the advanced features of a product, such as debugging tools or root access.

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