Whether or not you know the name, you've encountered a CAPTCHA before. It's the little window typically found at the bottom of an online registration form that's meant to separate real people from robots or scripts that could potentially flood a site with phony accounts and fraudulent purchases.
[I'm Not A Robot] Google Simplifies reCAPTCHAs For PCs And Mobile Devices
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Dingo
This is obviously a way to improve their image relation detection using us as data imput.
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9 л.
Saint
I believe this is also for desktops, or at least I don't see mobile exclusivity mentioned anywhere (also not on the cat pictures thing).
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9 л.
Rachel
Perhaps it would be funny if I pointed out the fact that you should select all the cat pictures as well... ..or maybe not.
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9 л.