Moloch, whose name probably derived from Melech "king" and Bosheth, "shame", was one of the deities worshipped by the idolatrous Israelites. He was referred to as "the abomination of the children of Ammon" (1 Kings 11:7) and the primary means of worshipping him appears to be child sacrifice or "to pass through the fire." Solomon was said to have built a temple to him.
"Then did Solomon build an high place for Chemosh, the abomination of Moab, in the hill that is before Jerusalem, and for Molech, the abomination of the children of Ammon." (1 Kings 11:7)
Sacrificing children was not uncommon, but the practice died down around the time of Jeremiah when the King defiled Tophet, the place where Moloch was worshipped.
"He also defiled Topheth, which is in the valley of the son of Hinnom, that no man might make his son or his daughter pass through the fire for Molech." (2 Kings 23:10)
"For the sons of Judah have done that which is evil in My sight," declares the LORD, "they have set their detestable things in the house which is called by My name, to defile it. They have built the high places of Topheth, which is in the valley of the son of Hinnom, to burn their sons and their daughters in the fire, which I did not command, and it did not come into My mind. Therefore, behold, days are coming," declares the LORD, "when it will no longer be called Topheth, or the valley of the son of Hinnom, but the valley of the Slaughter; for they will bury in Topheth because there is no other place." (Jer 7: 30-32)
Moloch has often been identified with Milcom, the god of the Ammonites. He was probably also identified with Baal, and as a sun or fire god, as he was also identified with the Assyrian/Babylonian "Malik", and at Palmyra "Malach-bel". Moloch is also identified with Baal Hammon in Carthaginian religion.