Explain in English
A foyer is a large entrance, like the foyer of a building that you enter before you reach the elevators. Sometimes a foyer is also called a "lobby."
Foyer originally was a term in French that referred to the room where actors waited when they were not on stage. Today, a foyer is a large entrance to a building or home. The bigger and fancier a mansion, office or apartment building is, the bigger and more ornate the foyer will likely be. After all, the foyer will be the first room that visitors see when entering.