What is Icon? Why and how we use them?

Holy Crucifixion [Jn 19:25]

Icon is a painting or Holy Image that used as an aid to devotion. Icon have been in use since the earliest days of the Christian Church. Actually, It God Himself who ordered to Moses in Exodus 25: 18 to make a picture of an Angel on the Arc of the Covenant saying, "And thou shalt make two cherubim's of gold, . . .". Icons have