passport
noun [ C ]
uk/ˈpɑːspɔːt/ us/ˈpæspɔːt/an official document containing personal information and a photograph, which allows you to travel to foreign countries and proves who you are:
a passport photo
a passport to sth
a very effective way of getting something you want:
Many students opt for business studies simply because it sounds like a passport to a good job.
A degree from that university is seen as a passport to success.