Final answer:
The capital of Belgium is Brussels, which is also the capital of the EU and the seat of NATO, making it an important political and economic hub in Europe.
Step-by-step explanation:
The capital of Belgium is Brussels, which also serves as the capital of the European Union (EU) and the seat of the North Atlantic Treaty Organization (NATO). Situated in the heart of Western Europe, Brussels is known for its significant role in international politics as well as for being a major services sector hub.
This is largely due to the presence of NATO and various components of the EU, which attract diplomats and foreign business people from around the world to the city. Additionally, Brussels is the largest city in Belgium and plays a key economic role due to its high-speed rail connections to other European cities, and the presence of major business centers in the region.