Rum and Coke, or the Cuba libre, is a highball cocktail consisting of cola, rum, and in many recipes lime juice on ice. The cocktail originated in the early 20th century in Cuba, after the country won independence in the Spanish–American War. It subsequently became popular across Cuba, the United States, and other countries. Its simple recipe and inexpensive, ubiquitous ingredients have made it one of the world's most-popular alcoholic drinks.
Fill a highball glass with ice, then add rum and Coca-Cola.
Garnish with a lime wedge.
Squeeze the lime into your drink, if desired and serve.