Which form of promotion is based on unpaid communication?

Question

Quizplus · Accepted Answer

Public relations is based on unpaid communication, where companies use different strategies to enhance their reputation, and stimulate interest in their products by making exceptional stories that are interesting to the public. Public relations is often referred to as earned media, which means that companies don't pay for the coverage they receive but earn it through media coverage or word of mouth.

Which Form of Promotion Is Based on Unpaid Communication