The café con leche is the Spanish variation of the Italian caffé latte (of which there are now many more variations & flavors). “Con leche” means ‘with milk’ in Spanish, referencing the drink’s 2 to 1 ratio of milk to coffee. The coffee used for this drink is usually very strong, so as to cut through the large amount of milk, presumably added to make the coffee last longer.
Sugar is usually included in a café con leche, but usually you’re provided with sugar cubes or packets in order to add your own. In Spain, this drink is typically served at breakfast, while in other parts of Europe it’s often also enjoyed at lunch. The brewed coffee can be substituted for another strong coffee, such as espresso or French press.