Final answer:
A public, web-posted document that can be added to or edited collectively by others is called a wiki.
Step-by-step explanation:
A public, web-posted document that can be added to or edited collectively by others is called a wiki.
This type of collaborative document allows multiple users to contribute, modify, and update its content.
A well-known example of a wiki is Wikipedia, an online encyclopedia that allows anyone to contribute and edit articles.