Passport is a must when you plan to go abroad. It is like your identity card, explaining where country you come from; ensure that you are the legitimate citizen of certain country. Without an eligible passport, you will not be allowed to enter any country in this world. No country will take a risk of welcoming anyone who possibly can be a terrorist or prisoner, and make riots in their country.

Once I read someone asked in a forum, about how to get a passport from a certain country where is he is not its citizen. It sounds ridiculous, as passport is only made for its own citizen, except a certain program like green card issued by the US government.