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Some incorporate the use of captcha to ensure user interaction.
A human brain can read captcha letters in seconds, however, even a supercomputer can not do that in a finite time.
Commonly, captchas are dynamically created images of random numbers and/or letters.
Also, many implementations of captchas (particularly ones desired to counter circumvention) are inaccessible to humans with disabilities, and/or are difficult for humans to pass.
The use of captchas is controversial.
Captchas are used by freemail services to prevent automatic creation of a huge number of email accounts and to protect automatic form submissions on blogs, forums and article directories.
A captcha is a challenge-response test frequently used by internet services in order to verify that the user is actually a human rather than a computer program.
