This is the 1393rd most frequent Korean word.
앱을
The Korean word "앱을" means "app" (application) in the object form.
Here, '앱을' is the object of the verb '사용해요' (use), illustrating its function as the direct object in the sentence.
나는 매일 앱을 사용해요.
I use the app every day.
In this sentence, '앱을' again serves as the object, this time of the verb '추천할게요' (will recommend).
이 앱을 추천할게요.
I will recommend this app.
'앱을' is used here as the object of the verb '다운로드했어요' (downloaded), showing its role in receiving the action of the verb.