Evaporated milk is evaporated whole milk, typically sold in cans. It varies from 0.5% fat to 8% fat, depending on whether whole milk or skim milk was used to make it.
Sweetened condensed milk is condensed milk with sugar added. It contains high a percentage of sugar (about 40%), up to 8% fats and 28% milk solids, and thicker. Many recipes that specify condensed milk actually mean sweetened condensed milk.
Condensed milk can be used to make many desserts and candies.
Condensed soy milk is also available.