✠✠✠✠✠Literally, iconoclasm (from Greek eikōn, image + klaein, to break.) is the destruction of religious icons and other sacred images or monuments, usually for religious or political motives. In Christian circles, iconoclasm has generally been motivated by a literal interpretation of the second of the Ten Commandments, which forbids the making and worshipping of "graven images." This is clearly a misinterpretation of the decalogue because if one continues to read through the Book of Exodus one would encounter the command to Moses to build the Tabernacle: a visible icon of the invisible God.
It was condemned as heresy at the Second Œcumenical Council of Nicaea.