What is the difference between e/z notation and cis-trans isomerism?

Answer 1

http://en.wikipedia.org/wiki/Cis%E2%80%93trans_isomerism

Answer 2

i have seen it but still don't understand.....

Answer 3

Try this one.
http://uk.answers.yahoo.com/question/index?qid=20100408040903AAup69p

Answer 4

is this mean that e/z notation can definitely explain cis-trans isomerism but cis-trans not necessary can explain e/z notation ?