Difference between ice cream and ice in Korean
아이스크림·얼음

아이스크림ice cream
Ice cream (아이스크림) is a cold, sweet food that people eat as a snack or dessert. You can buy it in a cup, cone, or bar, and it comes in many flavors like chocolate or strawberry. Use this word when talking about eating, buying, or liking ice cream.

얼음ice
The word "ice" means frozen water. In Korean, 얼음 is used for ice in a drink, ice in the freezer, or ice you see outside in winter. You can use it in simple daily sentences about home, shopping, or the weather.
The difference
얼음 is just frozen water, not a sweet dessert by itself. People put it in drinks or use it to keep things cold.