Puerto Rico or Commonwealth of Puerto Rico is a US Territory located in the Caribbean. From Wikipedia:
Puerto Rico is an archipelago that includes the main island of Puerto Rico and a number of smaller islands, the largest of which are Vieques, Culebra, and Mona. With around 3.6 million people, it ranks third in population and fourth in area among the Greater Antilles, which include Cuba, Hispaniola (Haiti and the Dominican Republic) and Jamaica. The capital and largest city is San Juan. Due to its location, Puerto Rico has a tropical climate with warm weather year-round and does not observe daylight saving time. Its official languages are Spanish, which is prevalent, and English.