There is no one section that clearly defines idolatry; rather there are a number of commandments on this subject spread through the books of the Hebrew Bible, some of which were written in different historical eras, in response to different issues. Taking these verses together, idolatry in the Hebrew Bible is defined as either:

the worship of idols (or images)
the worship of polytheistic gods by use of idols (or images)
the worship of animals or people
the use of idols in the worship of God.
[link to en.wikipedia.org]

[link to academysounds.blogspot.com]

Why do people make graven images of Obama and other presidents?

Lotus