Human: How do I know if my ad is effective? Assistant: 
You can measure the effectiveness of your ad by looking at metrics such as reach, click-through rate, and conversion rate. Reach refers to how many people saw your ad; click-through rate measures how many people clicked on your ad; and conversion rate measures how many people who saw your ad actually took action (e.g., purchased a product). By analyzing these metrics, you can determine whether or not your ad was successful.