Café au lait is a coffee drink from France. It is prepared by adding hot milk into the coffee. Equal parts of coffee and milk are added into the cup to make this coffee. Moreover, the flavour is not as strong as espresso and not as weak as normal milk coffee.
Further, the type of coffee used in preparation varies from country to country. For instance, in America French pressed coffee is used while in some places a combination of chicory, along with coffee is used. People often confuse this drink with Cortado, but they are not the same.