An "impression" in CJ Affiliate refers to when an ad or affiliate link is viewed by a user. You can get an impression when your affiliate link appears on a webpage or in an email. The impression happens even if the user does not click the link. You do not get paid for impressions. You only earn commissions when someone clicks your link and makes a purchase. The impression metric helps track how often your links or ads are shown. You can use impressions to understand the reach of your affiliate marketing efforts. Higher impressions can lead to more clicks and sales.