This is the 49th most frequent Ukrainian word.
де
"Where."
Here, 'де' is used as an interrogative pronoun to inquire about the location of someone or something.
Де ти був вчора ввечері?
Where were you yesterday evening?
In this sentence, 'де' introduces a relative clause, indicating the location or place related to the subject.
Ми шукаємо місце, де можна відпочити.
We are looking for a place where we can rest.
This usage of 'де' is as an interrogative pronoun to question the place of starting an action.