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The Caribbean Region is a massive archipelago located in the Caribbean Sea, subdivided into regions: the Lucayan Archipelago, the Greater Antilles, the Lesser Antilles, and the ABC Islands. With 13 sovereign states and 17 dependent territories in the Caribbean, the predominant languages are English, Spanish, French, Dutch and Antillean creole. 

Language: The official language of Cuba is Spanish, with about 90% of its population speaking it as their first language. Other languages spoken in the country include Haitian Creole, Lucimi, Galician, and Corsican.

Currency: The official currency of Cuba is the Cuban Peso (CUP) though they also use the Cuban Convertible Peso (CUC).

CARD PAYMENTS AND CASH WITHDRAWALS:

Cuba is primarily a cash economy. Credit cards are accepted in resort hotels and some city hotels. Most non-US-linked VISA and MASTERCARD credit cards are accepted in Cuba, but Visa is more widely spread than MasterCard.

However, no US credit or debit card can be used in Cuba, due to the official embargo between the two states.

Also, you will run into a 3% charge for every payment, so you might want to take a REVOLUT card with you, to eliminate bank fees. 

Plugs: In Cuba, the power plugs are type A, B, C, and L. The standard voltage is 110 / 220 V, and the standard frequency is 60 Hz.