reCAPTCHAjärjestelmä

reCAPTCHA is a free service from Google that helps protect websites from spam and abuse. It works by serving distorted letters and numbers that users must correctly identify. This process helps differentiate between human users and automated bots. There have been several versions of reCAPTCHA over the years, evolving to become more user-friendly and less intrusive. The original reCAPTCHA required users to decipher two distorted words. Later versions introduced the "I'm not a robot" checkbox, which analyzes user behavior and other signals to determine if they are human. If the system is unsure, it may present a challenge, such as selecting specific images. The primary goal of reCAPTCHA is to ensure that only legitimate users can access certain website functionalities, like submitting forms or creating accounts, thereby preventing malicious automated activity. This system is widely implemented across the internet and is a crucial tool for website security.