This is the 114th most frequent Japanese word.
ちなみに
"By the way" or "for your information."
ちなみに functions as an interjection to provide additional information casually.
ちなみに、私は昨日映画館へ行きました。
By the way, I went to the movie theater yesterday.
'ちなみに' introduces supplementary or related information following a statement.
このレストランは美味しいです。ちなみに、駅から徒歩5分です。
This restaurant is delicious. Incidentally, it's a 5-minute walk from the station.
ちなみに introduces tangential yet relevant information to the conversation.