Difference between ice cream and snack in Korean
아이스크림·과자

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.

과자snack
과자 means snack, usually a small packaged food like chips, cookies, or crackers. People use this word when talking about something they eat between meals. It is common in daily life at home, at school, in stores, or on a trip.
The difference
과자 usually means snacks like chips, crackers, or cookies. It is not usually a cold, creamy dessert.