CAPTCHAs were invented to stop spamming robots from infiltrating forums, ticket-buying websites, and other areas of the web. The most familiar CAPTCHAs use distorted text that a user must type into a box, but newer tests can incorporate images and even games.
What Is CAPTCHA (Besides An Online Annoyance)?
Key Facts In This Video
In 1864, people were upset about an unsolicited telegram advertising a dental practice, one of the very first pieces of spam. 00:04
In 1998, Yahoo was besieged by millions of spambots setting up email accounts. 00:33
Computers have become better at reading CAPTCHAs, prompting CAPTCHAs to become more difficult. 01:05
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