1. Welkom (Dutch): This is the most common greeting in Flanders, the Dutch-speaking region of Belgium. It's a direct translation of "welcome" and is used in most situations.
2. Bienvenue (French): This is the common greeting in Wallonia, the French-speaking region of Belgium. It's the French equivalent of "welcome."
Note: There are also some regional variations within each region, and some people might use informal greetings like "Dag" (Dutch) or "Bonjour" (French) depending on the situation.