Here are some definitions of terms used in this site

Wiki -

Wikis are websites that can be interactively edited by any number of people using simple online tools. An incremental version of the website is stored each time an edit is saved, making it possible to ‘rollback’ the site to any previous version if subsequent edits need to be undone. What sets wikis apart from other ‘social’ writing and publishing tools (e.g. blogs, photo-sharing, podcasts) is that more than one person typically contributes to the authoring and publishing of specific content, and most wiki tools include a range of features to facilitate these multi-author interactions. (Judd 2010)

Educause (2005) describes a wiki both an asynchronous and a synchronous tool, as it enables its users to view and modify content in a collaborative manner in real-time and non real-time manner. Wikis feature multimedia capabilities and they make it easy to instantly edit and publish information. Using Wikis facilitates different learner styles through the flexibility, interaction, and collaboration that learners become engaged with (Educause, 2005).