CAPTCHA
A CAPTCHA (Completely Automated Public Turing test to tell Computers and Humans Apart) is a challenge-response test used to determine whether a user is human.
Web scrapers encounter CAPTCHAs as bot-detection roadblocks. Advanced scrapers bypass them using CAPTCHA-solving services, behavioral mimicry, and residential proxies that make traffic look human.
Related Terms
Anti-Bot Protection
Anti-bot protection refers to the suite of server-side and client-side defenses websites use to detect and block automated traffic.
Proxy Rotation
Proxy rotation is the practice of cycling through multiple IP addresses when making scraping requests, so the target server sees different IPs instead of repeated requests from the same source.
Headless Browser
A headless browser is a web browser that runs without a graphical user interface.