Feed Stats provide a snapshot of the aggregate statuses of your various feeds in real time.
Products In Feed: The total number of products that are currently being sent to your various channels
Store Products: The total number of products imported from your store OR imported from your uploaded file or URL feed
Approved Products: Products approved by your channels and eligible for display in ad campaigns
Disapproved Products: Products disapproved by your channels and thus not eligible for display in ad campaigns