Reading comprehension test?

• Weapon against automated enemies
• Challenge to prove you're human
• Test to ensure a response is not generated by a computer
• Technology that I guess has outed me as a robot because I always get it wrong
• Web test that might have accessibility issues
• Spell check?
• Challenge for a web user
• Test for screening out bots
• Suitable leaders of children's holiday activities go after Conservative - it proves humanity

Wikipedia Word definitions in Wikipedia
A CAPTCHA (a backronym for " C ompletely Automated P ublic Turing test to tell C omputers and H umans A part") is a type of challenge-response test used in computing to determine whether or not the user is human. The term was founded in 2003 by Luis von ...