Impressions - also called 'views' - refer to instances where a banner has been retrieved from our servers and loaded on a website. When this happens, it is considered as 'seen' by a user and registers on Tapfiliate as an impression.
To be able to track impressions, you must have already set up image/banner marketing assets. You can find out how to set those up here.
Note: Tapfiliate only tracks impressions for banners loaded on one of your affiliate's websites/blogs, and not on social media sites.