CAPTCHA is an acronym that stands for “Completely Automated Public Turing test to tell Computers and Humans Apart”.
CAPTCHA prevents spambot from creating multiple accounts and ensures that the Users you have on your account are the users you need to be communicating with.
The CAPTCHA can be activated through:
1. Click Settings
2. Click Users tab
3. Scroll down and check Captcha on login form is not set to default and is Yes
The CAPTCHA will now always be present on your registration form and will force Users upon registration to complete it before they can register.