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If you are computer savvy, you would know how to take a screen shot of the screen displayed on your personal computer. You may even know how to take a screen shot on a smart phone and tablet. But taking a screen shot of a website by visitors is a different altogether. As a website master, you might receive complaints from your customer that there's some problem with your website and they think it has been hit by malware or a virus or has been hacked. Or some function of the website is not displaying the page that it's supposed to. Your first action would be to try and understand the problem by questioning the site visitor. But what if the visitor does not understand your questions or is talking in a different language. Now you are faced with a real problem for which you don't have a ready-made solution. Also, you don’t want to disappoint and lose your potential customer.
In such cases, your best option would be to ask your visitor to take a screen shot of your site and mail it to you. But here you are most likely to hit another issue, which is that your visitor does not know how to take a screen shot to email to you.