Captcha uses human-computer interaction challenges to test whether a user is legitimately a person. The person is required to recognize objects in pictures to continue to interact with the webpage.
For some websites, the use of Captcha is conditionally based on the IP address. If you do not get a Captcha pop-up when you go to the webpage in the browser, but the Captcha pops up when using Visualping, there's a good chance Captcha has been configured to only pop up for non-residential IP addresses. For those webpages, using residential proxies with Visualping may bypass the Captcha pop-up.
For more information on residential proxies, please contact your sales representative.