Aallows users to add, remove, or edit its content.

In a wiki, the users can add or remove or edit their content.

Explanation:

wiki is a knowledge base website.

The wiki is a website where the users can together change the content.

In the normal wiki, the content is written in simple language and we can edit the text.

In the wiki, the users have the freedom to add, remove, or to edit their content.

Wiki is the content management system that means the users can modify the content as per their requirements.

it can either be 2. or 4. : ) tell me if i'm wrong or right