Explain what a wiki is and list its advantages.

Explanation:

Wikis are defined as a form of a website or web page or a database where the users can work on the data, they can even add or edit the data. Wikis use a very quick as well as a easy syntax that allows the users to format the text and create various links between the pages. The users need internet browsers for that.

One of the main advantage of wiki is that it provides ability to collaborate asynchronously, and also without  time constraints.Besides it also provides a beneficial function of something. It is free and not expensive.

difference where there's no picture?

answervisible;