Anti-bot (CAPTCHA) is the special mechanism to protect your store from the spam bots, for example, to avoid placing inappropriate advertisement reviews, creating invalid personal accounts, placing orders, etc.
The default CS-Cart platform uses the special form to input the alphanumeric code. This is a pretty simple solution which some modern bots can bypass.
There is one more sophisticated form developed by Google and called Google reCAPTCHA. It has several options, e.g., inputting texts after the listening the audio fragment, picking up the corresponding images, etc.
The CAPTCHA can be placed on the Order Tracking form, the Send to friend form, the Call request and buy now with one click form and any other custom forms created by the store administrator.