A computer program or system intended to distinguish human from machine input, typically as a way of thwarting spam and automated extraction of data from websites.
More example sentences
- The spammers are thinking up ever more ingenious ways to break the captchas.
- Every time you edit a page, you have to pass a captcha.
- I guess the spammers tools are too simplistic to even attempt to break the captcha.
early 21st century: acronym from Completely Automated Public Turing test to tell Computers and Humans Apart.
Definition of captcha in:
- The US English dictionary