CAPTCHA — is a security test that a website shows to a user to make sure they are a real person rather than a bot or program. The most common examples are selecting images with traffic lights, checking the «I'm not a robot» box or entering distorted letters from an image.
In traffic arbitrage, CAPTCHA is a common obstacle during mass account registration, automated posting or working with bots. When an affiliate marketer needs to create dozens of profiles on social networks or ad accounts, platform anti-fraud systems start bombarding them with CAPTCHAs to block automation.
What it is used for
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Bot protection. Helps websites and social networks defend against spam, automated registrations and password hacking.
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Traffic filtering. Advertising network security systems use CAPTCHA to filter out suspicious requests before a bot can reach the ads.
Main types
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Text and image puzzles — classic images with distorted text or grids where users need to find specific objects.
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Invisible CAPTCHA — tests that run in the background (such as Google reCAPTCHA v3): the system automatically analyzes mouse movements and user behavior without requiring them to click anything.
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Interactive challenges — simple puzzles, sliders or game elements that need to be dragged into the correct area.
Advantages
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Reliably protects websites and accounts against automated attacks and spam bots.
Disadvantages
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Makes life significantly harder for affiliate marketers when automating processes and creating accounts.
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Sometimes frustrates regular users when the system mistakes them for bots too often and forces them to spend a long time solving puzzles.
