1.) The ego is who we think we are. The ego latches onto roles, labels, appearances and possessions and then makes value judgments.
2.) The ego establishes what we value; in ourselves and in others. Things of value might include appearance and material possessions.
3.) The ego is that part of us that separates us from one another. It is that false sense of I that says, you are separate from me. I am Christian, you are Muslim and we are both separate from God.