Auto-optimization by Creativity: Checking this would distribute traffic to your different creatives based on their performance and number of conversions.  

For Example: Let say you have 3 creatives and one of them is converting more than the other 2.  By enabling the traffic distribution A.I. feature, the platform would automatically start sending more traffic to the better converting creative based on how many more conversion that creative has.  

*For our traffic distribution A.I. to work, you must be sending the conversions in the postback.