The default bid strategy for most objectives. Meta will attempt to get you the highest volume of optimized actions within your budget. No concern will be given to value, ROAS, or cost per action.
Impressions
Impressions are the number of times your ads were displayed to your target audience. Impressions aren’t counted if it is detected they came from bots.
Instagram Account Custom Audience
An Instagram account custom audience allows you to target people who engaged with your Instagram business account with Facebook ads.
Landing Page View
Landing Page View is a Facebook ads metric that represents when people land on your destination URL after clicking a link in your ad.
Lead Form Custom Audience
Lead form custom audiences allow you to create audiences of people who engaged with your Facebook lead ad forms to be used in ad targeting.