Milk Fat Changes the Function
Cream is not one single culinary product. As milk-fat concentration increases, richness, body, whipping ability and sauce performance change. Lower-fat cream is useful for beverages and lighter preparations, while higher-fat cream is more reliable for whipping, reduction and rich sauce work.
The names used for cream vary by country, so professional cooks should read the actual milk-fat percentage whenever a formula depends on structure or whipping.