La bise est une coutume importante en France.

Pronunciation: Lah beez eh oon koo-TOOM eem-por-TAHNT ohn Frahnss.

Meaning: The kiss on the cheek is an important custom in France.

The number of kisses varies by region—typically two, three, or four—so it's wise to follow the lead of your French acquaintances to avoid awkwardness.