CAPTCHA

CAPTCHA is used around account creation, contact forms, logins and other workflows that automated scripts can abuse. Some implementations ask people to solve a visual puzzle; others analyze interaction signals or device context, sometimes without presenting a visible challenge. It is a form of abuse friction, not proof that every successful submission came from a genuine customer.

CAPTCHA creates trade-offs. An inaccessible image or audio puzzle can block legitimate users, especially people using assistive technology. It can also frustrate mobile visitors and add time to a quote request. A site should combine appropriate rate limiting, server-side validation, monitoring and other defenses rather than treating the challenge as a complete security system.

This is the general concept. Accessible CAPTCHA is the related design problem of ensuring that an anti-bot mechanism does not exclude disabled users. The two topics should be linked without duplicating their scope. Before selecting a product, evaluate privacy implications, reliability, bypass risks and accessible alternatives.