у

This is the 2nd most frequent Serbian word.

у

"In" or "at" (used to indicate location or position).

Here, 'у' is used as a preposition signifying location or containment.

Књига је у кући.

The book is in the house.

In this sentence, 'у' indicates a location where an action occurs.

Она у продавници купује воће.

She buys fruit at the store.

Here, 'у' is employed to specify a time period.

У зимско време, често пада снег.

During the winter season, it often snows.