In one line
Paying a creator in products or services instead of, or as well as, money.
An Ahmedabad café offers a tasting meal in return for a short video. That is barter.
Barter is still a commercial deal: the post usually needs an ad label, and the value of what the creator receives can have tax consequences.
Agree: the value of what is given, the work in return, the dates, and who keeps any product.

