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CAPTCHA

A CAPTCHA is a type of challenge–response test used in computing to determine whether the user is human in order to deter bot attacks and spam.

Advantages of CAPTCHAs include:

• They prevent spam from automated programs that could send emails, comments or advertisements.
• They prevent fake registrations or sign-ups for websites.
• CAPTCHAs are familiar, so website visitors automatically understand what they are tasked to do.
• CAPTCHAs are also easy to implement in building a website.

Disadvantages of CAPTCHAs include:

• CAPTCHAs are not foolproof and can only limit spam.
• They can be time consuming or annoying to end users.
• To some people, CAPTCHAs may be challenging to read.
• Websites using CAPTCHAs may notice traffic decreases because users find the tasks difficult.