A wiki is a website that allows users to collaboratively add and edit content. Wikis have several educational benefits such as promoting asynchronous communication, emphasizing student-centered learning, and facilitating teamwork. Wikis can be used in the classroom for activities like creating e-portfolios, online journals, collaborative projects, and sharing resources. However, there are issues like potential inappropriate content or vandalism that require solutions like setting security levels and monitoring the wiki. Creating an educational wiki is quick and easy using providers like Wikispaces, PBwiki, or Wetpaint.