ちなみに

ちなみに is a conjunctive adverb used to introduce supplementary or related information — similar to "incidentally" or "by the way" in English.

Writing

Can be written as 因(ちな)みに, but hiragana is much more common.

Usage

• Introduces related but tangential information
• The added information should have some connection to the main topic
• Typically placed at the beginning of the supplementary sentence
• Example: 東京(とうきょう)タワーは1958年(ねん)に完成(かんせい)しました。ちなみに、スカイツリーは2012年(ねん)です。

Similar words

• ちなみに: incidentally, by the way (the addition is related to the topic)
• ところで: by the way (can shift to a completely different topic)
• ついでに: while at it, while we're on the subject

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Usable in both casual and semi-formal speech. Common in presentations, articles, and everyday conversation.