How Does CAPTCHA Work? (Captchas Explained)

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What does CAPTCHA mean? The acronym stands for Completely Automated Public Turing Test to Tell Computers and Humans Apart. The purpose of CAPTCHAs is to serve as a tool for differentiating a human being from a bot.


CAPTCHAs explained. CAPTCHAs are mainly used to protect websites from malicious acts. Many internet sites ask users for CAPTCHA validation to avoid getting abused by bots.

reCAPTCHA is a type of CAPTCHA that uses artificial intelligence and advanced machine learning to create more efficient, less disruptive bot tests

There are several ways in which CAPTCHAs can be used. For example, free email platforms use CAPTCHAs to stop malicious bots from spreading spam advertisements. Ticket sellers may use CAPTCHAs to prevent resellers from using bots to get tickets to the most popular events within seconds after their release and then reselling them at higher prices.

What triggers CAPTCHA? If a website suspects that the user is a bot, a CAPTCHA arises. It can be caused by, for example, sending multiple frequent requests to the same target.

How does CAPTCHA work? A task is given to rewrite a certain word or pinpoint a specific image. For a human being, such a task is an effortless afterthought. However, for a machine, it should be an impossible task. This kind of filtering is set up to avoid unwelcome automated visitors and to protect the upper limit of server load thresholds.

For those who perform web scraping, solving CAPTCHAs may be a real headache. Being blocked or encountering CAPTCHAs are some of the most common challenges, interrupting large-scale public data-gathering operations.

However, there are multiple ways to avoid CAPTCHA, such as using rotating proxies, changing user agents, and employing website crawling tools.

Find out more about blocks when web scraping:
https://youtu.be/SCs1KgVMlh0

For more topics on all things web scraping:
https://www.youtube.com/playlist?list=PL635Vr00fwj-79sD_y9gClyTaShIBPOmG

Watch these related videos:
Web scraping tips and tricks:
? https://www.youtube.com/watch?v=-oZD9VqvV9k&list=PL635Vr00fwj_fzpXxWcyTjnkJbxjwQi8g
How to scrape multiple website URLs with Python:
? https://www.youtube.com/watch?v=Raa9f5kpvtE

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In this video, our Copywriter Maryia explains how CAPTCHA works and covers the following:
0:00 Introduction
0:35 What is CAPTCHA?
0:48 How do CAPTCHAs work?
1:17 How are CAPTCHAs used?
2:22 What is the difference between CAPTCHA and reCAPTCHA?
2:55 What triggers CAPTCHA?
3:21 How to avoid CAPTCHA?
4:26 The bottom line

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