It’s Coconut Milk or Cream that has been thickened, with sugars added to sweeten it. There’s powdered and tinned versions; tinned versions have stabilizers added so that the liquid doesn’t separate.
A well-known brand in America is Coco Lopez.
Cream of Coconut is used for sweet dishes such as desserts, and for making mixed drinks (generally alcoholic) such as Piña Coladas and Bushwhackers.
Regular Coconut Milk, sweetened with a few tablespoons of sugar per tin, but use less Coconut Milk than you would Cream of Coconut, as the milk is thinner.