Answer:Reputation systems
Step-by-step explanation:
Reputation systems this is a process in which online users rate each other as online communities this is done in order to create trust by their reputation.
This system is used by E-commerce websites such as eBay, Amazon.com and others
Having a web reputation is crucial because online content has many pages to view each day, the competition is very tight without these rankings the Web will lose its reputation and its audience.