tech
Those little tests that ask you to read distorted text or pick out images help websites block spam and fake accounts.
A CAPTCHA is a small challenge, such as reading distorted text, identifying objects in images, or solving a simple puzzle, that websites present to visitors in order to distinguish real human users from automated computer programs, or bots. Because bots can be programmed to create accounts, post spam, or scrape data at massive scale far faster than any human could, CAPTCHAs act as a simple gatekeeping test that's designed to be easy for people but difficult for automated software to solve reliably.
Speeding up how fast a website loads is a matter of web performance optimization, entirely unrelated to distinguishing humans from bots. Storing passwords securely is handled by password managers and encryption systems, a different security function from verifying whether a visitor is human.
As AI systems have become better at recognizing distorted text and images, CAPTCHA designers have had to continually invent new, harder challenges, an ongoing back-and-forth that has pushed some websites toward newer approaches like analyzing subtle patterns in mouse movement or click behavior instead.
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