CAPTCHA, Completely Automated Public Turning Test to tell Computers and Humans Apart, it is a one type of test. CAPTCHA is standard internet security they protect online emails and services from being abused by malicious computer program or BOT. CAPTCHA is a one type of test program that protects websites from BOTs on web by generating tests that computer cannot pass but human can easily pass. For web security we are using different type of CAPTCHA. In this paper describe different type of CAPTCHA technique based on drag and drop mouse action because drag and drop mouse action is performed by human not by BOT. This paper is deal with survey and comparison of different technique of CAPTCHA.