Final answer:
A website that allows users to add, edit, or delete content is known as a wiki, with Wikipedia being a prime example.
Step-by-step explanation:
A website that allows you to add, edit, or delete content and structure is commonly known as a wiki. Unlike a blog post or a page on a website, a wiki is a collaborative space where multiple users can contribute and modify content. One of the most well-known examples of a wiki is Wikipedia, which allows registered users to edit pages and contribute to the collective knowledge base. This editing process often includes a suggested structure for your content that can be modified when you click the Edit page button in your user bar, add your content, and hit Save.