Bible study: What is idolatry?

Deuteronomy 5 vs. 9 – Thou shalt not bow down thyself unto them, nor serve them: for I the LORD thy God am a jealous God, visiting the iniquity of the fathers upon the children unto the third and fourth generation of them that hate me,

1. Idolatry is serving or worshipping anything apart from the God of Israel, Jehovah
2. Idolatry provokes the fierce/anger of God