I've been sent a scan of a document as an attachment. Clicking on it, I get the message, "Pixel aspect ration correction is for preview purposes only. Turn it off for maximum image quality." What is pixel aspect ration and how do I turn it off?

I've been sent a scan of a document as an attachment. Clicking on it, I get the message, "Pixel aspect ration correction is for preview purposes only. Turn it off for maximum image quality." What is pixel aspect ration and how do I turn it off?

It's "aspect ratio", not aspect "ration". 
It's what determines whether you have square pixels ("normal") or, if rectangular pixels, what the aspect ratio (width : length)  of that rectangle is.
It's explained in the Help files.  I cannot go into more detail because you have neglected to provide information about your platform and exact version of Photoshop.
Example in next post

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