Impressions - The number of times your ad is shown to users.
Spend - Total spend amount of the campaign.
CPM - Cost per mile (thousand impressions). Calculation: Spend/Impressions*1000
Reach - Number of people that saw your ad.
Avg. Frequency - The average number of times your ad was served to each user. Calculation: Impressions/Reach
Engagements - Any type of engagement with your ad. For example - like, video view, reply, comment, follow etc.
EGx - Engagement rate. Calculation: Engagements/Impressions*100
Clicks (app clicks, link clicks) - First engagement that drives the user to the goal of your ad.
CTR - Click through rate. Calculation: Clicks/Impressions*100
CPC - Average cost per click. Calculation: Spend/Clicks
Campaign pacing - The rate at which your campaign is delivering budget. Campaign pacing can be calculated on daily or total time period.