What are the different types of CAPTCHA challenges Cloudflare offers?

Cloudflare offers several types of CAPTCHA challenges. The most common is the 'I'm not a robot' checkbox (often referred to as hCaptcha or reCAPTCHA v2), which uses JavaScript to analyze user behavior. They also offer "Managed Challenge" which presents a frictionless challenge if the visitor's browser is deemed safe, or a more interactive challenge like an image-matching puzzle if needed. "Turnstile" is their latest offering, aiming for a seamless experience by solving the challenge in the background without user interaction where possible.