This is the 711th most frequent Japanese word.
アイス
"Ice" or "ice cream."
In this sentence, "アイス" stands for "ice cream," emphasizing its popularity during hot weather.
暑い夏の日にはアイスがとても美味しいです。
Ice cream is very delicious on hot summer days.
Here, "アイス" refers to "iced," as in iced coffee, indicating a cold version of beverages.
コーヒーを飲むときに、私はアイスとホットのどちらにするか迷います。
When I drink coffee, I hesitate whether to choose iced or hot.
In this case, "アイス" means ice for cooling purposes, showing its utility other than as a treat.