A wiki is a collaborative website that allows users to create, edit, and organize content easily. The most famous example is Wikipedia, an online encyclopedia where anyone can contribute information on a wide range of topics. Wikis are designed to be user-friendly, enabling people with varying levels of technical skill to participate in building knowledge. Wikis often use a simple markup language for formatting, making it easy to add links, images, and other media. They are commonly used for project documentation, community forums, and educational resources, promoting collective knowledge sharing and collaboration among users.