Carajillo is a Spanish drink combining coffee with brandy or rum. It is typical of Spain and its origin dates to the Spanish occupation of Cuba. The troops combined coffee with rum to give them courage (coraje in Spanish, hence "corajillo" and more recently "carajillo").
There are many different ways of making a carajillo, ranging from black coffee with the spirit simply poured in to heating the spirit with lemon, sugar and cinnamon and adding the coffee last.
A similar Italian drink is known as caffe corretto.