A mindmap, also written mind map, is a diagram used to represent words and ideas linked to and arranged around a central key word or idea.
Mindmaps are often used with brainstorming activities to generate, visualize, structure, and classify ideas. In other words, what crops up during the brainstorming session is put down on paper in real time as a mindmap.
In this way they function as an aid in study, organization, problem solving and decision making. They are, in reality, similar to concept maps in that they are graphical tools for organizing and representing relationships among concepts.
Mindmaps are useful for pre-teaching words in the context of words students already know, and revising newly-learnt words.
As they link ideas, mindmaps are better suited to learning new words and/or revising old ones than the traditional list format and students should be encouraged to make their own ones for homework, etc.