This is the 426th most frequent Japanese word.
チーズ
Cheese.
Here, チーズ (cheese) is used as a noun to indicate the food product.
私はチーズを食べるのが大好きです。
I love eating cheese.
In this sentence, チーズ (cheese) is used as an interjection said when being photographed, derived from its pronunciation encouraging a smiling expression.
写真を撮る時、「チーズ」と言ってください。
When taking a photo, please say 'cheese'.
Here, チーズっぽい (cheese-like) is an adjective form describing the sauce having qualities resembling cheese.