What are the differences between Margarine and Butter?

I see / hear so many inconsistencies in recipies that use Butter and others that specify Margarine. What are the Differences between these two forms of Poly-fats (etc.)? Is what I learned in my Home ec. class I took many-many-moons ago still Factual? And which is customarily more tasty (I know this depends... show more I see / hear so many inconsistencies in recipies that use Butter and others that specify Margarine.
What are the Differences between these two forms of Poly-fats (etc.)? Is what I learned in my Home ec. class I took many-many-moons ago still Factual?
And which is customarily more tasty (I know this depends upon how it is served)?
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