A booster campaign is a recommendations campaign targeted to people who opened but did not click on the previous recommendations campaign, but with a new set of recommendations. This gives your campaign efforts a boost.
First, Create a Recommendations Campaign:
Follow this guide if you need help.
Once you schedule or send your Recommendations campaign, a Resend and Booster campaign series will automatically be scheduled for you, following the sending of the Recommendations. You are welcome to unschedule these and change the schedule if you wish.
If you wish to create the Booster campaign from scratch, simply click the dropdown on the related Recommendations campaign, and press Create Booster Campaign. This will generate a copy of the original recommendations campaign, while assigning different recommended items to each recipient, and automatically sets the audience to be only those who opened but did not click your Recommendations or Resend campaigns.