A tiddler is the fundamental atom of content in Tank. It's also used in TiddlyWeb, TiddlySpace and originates from TiddlyWiki.

At first glance a tiddler is the same as a page in a wiki. It's true that it can be used in this way but there is a difference: A tiddler has three important features:

• It can be any media type
• It can be manipulated with the API
• It can be represented in a variety of forms.

A tiddler is the building block that allows you to compose both content and functionality. In Tank nearly everything you see is built from tiddlers. This documentation is made up of tiddlers. The CSS which controls the presentation is tiddlers. Applications in comps are tiddlers.