- They can give her an idea of how often her ad is shown to potential customers
- They can help her calculate how often someone clicked on her ad and then converted
- They can help her evaluate how engaging her ad is to potential customers
- They can give her an idea of how often someone clicked on her ad
Explanation: Impressions show you how often your ad is shown on a search result page or other site on the Google Network. Impressions can be especially important in branding campaigns because they represent how many customers actually laid eyes on your ad.
Read more here: https://support.google.com/partners/answer/6172653?hl=en