What do you mean by bot trap that shows on display while clicking ads?......

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On this day i found a strange message while clicking ads on a particular ptc site.... It is showing the message like..... Bot trap...Do not click.....Cheater link...... If you click this link, your account will be suspended for five days... I really shocked on seeing this type of alert message! Let me know the correct meaning of 'bot trap' here! What are the precautions to avoid this type of messages on site?....