Google reCAPTCHA is a service designed to protect websites from automated bot traffic and abuse. The system analyzes user interactions to distinguish between legitimate human users and automated bots attempting to access web applications. reCAPTCHA operates by evaluating various signals and behavioral patterns during user interactions with websites. The service helps prevent automated attacks such as credential stuffing, spam submissions, and fraudulent account creation. The technology has evolved through multiple versions, with newer iterations reducing friction for legitimate users while maintaining security effectiveness. The service can be integrated into web forms, login pages, and other interactive elements where bot protection is needed. reCAPTCHA provides website owners with tools to configure security thresholds and customize the user experience based on their specific requirements. The service generates risk scores that help determine whether additional verification challenges are necessary for particular interactions. Organizations use reCAPTCHA to protect various web-based functions including user registration, password resets, payment processing, and content submission forms. The service aims to reduce abuse while minimizing disruption to genuine user activity.