A campaign is a program that runs a specific email template using specific rules and timing.
Campaigns can be used for different purposes such as feedback solicitation, order status/delivery notification, product support, and many others.
Each campaign will run only once a day based on the specific timing rules you've selected.
When you activate a campaign, it will target all future orders. You can target past orders by selecting target past orders when you select "save and send"
You can run as many campaigns as you want at once.
There are two types of campaigns the Custom Email Campaign and the Review Request campaign.
For information on which type of campaign you should use, refer to https://support.feedbackwhiz.com/hc/en-us/articles/360052841713-Which-campaign-type-should-I-use-