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Marjoram is an herb in the mint family.Square stems, opposing leaves. It tastes very much like oregano, but the flavor is milder and more delicate. The flavor profile changes a bit from one species to another, somerimes favoring minty, citrusy, and even a little piney.
Again, it depends on the species, and your taste prefrence. Run of the mill, grocery store marjoram will most likely just taste like mild oregano to you. If you grow your own, you can choose a variety you prefer.
Buy a little bottle and taste it, see if you like it.