A passport is an official, worldwide recognized and usable travel document in the format of a booklet issued by the relevant authority in a particular State to its nationals.
One must make a distinction between a passport and an identity card which, as its name implies, is just a single card.
Belgian passports are valid 7 years (5 years for minors).
Any Belgian citizen can be issued his or her own passport starting at birth.
It is possible to travel to around 50 countries using an identity card, but a passport allows its holder to travel to any country in the world, subject to fulfilling any applicable visa requirements.