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Captcha serves a vital function in defending web platforms against bot-driven logins by distinguishing between human users and bots. When someone tries to access an account, a verification puzzle may appear, demanding the user perform an action that is straightforward for humans yet nearly impossible for scripts. This could involve deciphering warped characters, clicking on pictures with cars, traffic lights, or street signs, or solving basic visual or logic puzzles.

These tasks are strategically designed to leverage cognitive abilities that current AI and bot technologies struggle to replicate reliably. Without Captcha, attackers could automate credential stuffing attacks at scale, a method referred to as credential stuffing. By embedding these hurdles, Captcha slows down or halts automated login attempts, thereby decreasing exploit success rates.

It also plays a key role in thwarting credential-based compromises, hindering large-scale information leaks, and curbing spam registrations that commonly emerge after password leaks. Although not a perfect solution, đăng nhập jun 88 Captcha continues to be a powerful defense mechanism when integrated alongside additional defenses such as strong password policies, adaptive authentication methods, and rate-limiting login requests.

As AI-powered scraping systems grow more sophisticated, Captcha systems continuously adapt, becoming more complex while ensuring accessibility for legitimate users. This simple verification step is a subtle but indispensable line of defense in the ongoing battle to secure digital accounts.