A captcha let you check if the user is a human, instead of a bot.
If you want to enable Captcha, simply open and modify the Settings.xml (from C:\inetpub\wwwroot\WebChat_ucc_name\sfbwebchatplus\xml\) file and change the Captcha parameter and set it to true.
This will result in the following Captcha, which opens before a customer can start chatting.
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