This is the 554th most frequent Russian word.
кстати
"By the way" or "incidentally."
'Кстати' is used as an introductory phrase to bring up a related or unrelated topic in the conversation.
Кстати, ты где купил этот свитер?
By the way, where did you get this sweater?
'Кстати' is used here to add supplementary information to the statement, highlighting its relevance.
Этот магазин, кстати, работает до позднего вечера.
This shop, by the way, is open until late evening.
'Кстати' is utilized to emphasize and draw attention to the additional clause that provides significant detail.