A wiki is a collaborative website that allows users to easily add and edit content. Wikis are useful educational tools as they encourage collaboration and sharing of information. They allow students and teachers to work together online to create and edit documents, discuss course materials, and build a community of learners. Key benefits of using wikis in education include reducing redundant work, interlinking concepts, enabling multiple edits of content, and making information searchable and updatable over time. Teachers can create wikis for managing class materials and discussions, while students can use wikis for collaborative research projects and distributing what they've learned.