What is the purpose of ego?
Ego has a big and beautiful purpose in our life. It is said that the purpose of ego is to cause you great levels of unhappiness and suffering so that hopefuly one day after trying to change the world and people around you, you can look inside and decide to change yourself.
What is your ego?
Your ego is your conscious mind, the part of your identity that you consider your "self." If you say someone has "a big ego," then you are saying he is too full of himself.