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If you want to go abroad, you have to take a form of ID with you. This could be a passport, or a national ID card, and it has to have your phoot on it. You should also check out the rules for under 18s traveling on their own on the website of the embassy of the country you are going to. For example, for some countries, you need to have a letter from your parents giving permission for you to travel alone. If you don't have that, you might find that you are not allowed into the country! You should also buy travel insurance in case anything happens, for example, if you lose your luggage or if you have a medical emergency.