I don't really understand the whole idea of Flow Charts. Can someone explain them to me? My geometry teacher doesnt do a good job explaining it. I don't understand the book either

Question

Since this is not my area of expertise, I searched Google under the key words "flow charts" to get these possible sources:

http://deming.eng.clemson.edu/pub/tutorials/qctools/flowm.htm
http://www.gcseguide.co.uk/flow_charts.htm
http://en.wikipedia.org/wiki/Flowchart
http://www.mcli.dist.maricopa.edu/authoring/studio/guidebook/flow.html

I hope this helps. Thanks for asking.