I found this definitions.
Graphic organizers: A series of visual charts and tools used to represent and organize a student’s knowledge or ideas. Graphic organizers are often used as part of the writing process to help students map out ideas, plots, character details and settings before beginning to write. As part of the reading process, graphic organizers can help a student comprehend what he has read and make comparisons to other pieces of writing.
Graphic organizers can be used to: sequence events, analyze cause and effect, compare
Vocabulary Graphic Organizers
Graphic organizers help students to visualize the relationships between words and their possible meanings. Teachers can use these graphic organizers with their explicit vocabulary instruction. These tools may also be used as classroom assessment for learning because they give teachers a quick look at students’ vocabulary knowledge. A variety of samples have been provided.
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and contrast and develop concepts in detail.
Examples of: Venn diagram, story web, K-W-L (Know, Want to Know, Learned) charts, storyboards, word webs, flow charts, cause-and-effect diagrams
http://childparenting.about.com/od/schoollearning/a/graphic_organizer_def.htm
http://wvde.state.wv.us/strategybank/VocabularyGraphicOrganizers.html
Now I know what they are.