Final answer:
A wiki is a collaborative website that allows users to create, add to, modify, or delete website content via crowdsourcing.
Step-by-step explanation:
A wiki is a collaborative Web site that allows users to create, add to, modify, or delete the Web site content via crowdsourcing.
Crowdsourcing is the process of obtaining needed services, ideas, or content by soliciting contributions from a large group of people, often from an online community. In the case of a wiki, users can contribute and edit the content, making it a collaborative platform.
Examples of wikis include Wikipedia, the online encyclopedia, which is created and updated by thousands of volunteers.
It is important to note that while wikis provide valuable information, they are not considered a quality source for academic research because they are not peer-reviewed.