Introduction or presentation: introducing a person or thing to someone, or presenting/showcasing something (e.g., a product); can also mean referral.
友達に彼を紹介したら、二人はすぐに意気投合した。
When I introduced him to my friend, they hit it off immediately.
イベントで新製品を紹介する予定だ。
We plan to showcase the new product at the event.
自己紹介を簡単にお願いします。
Please give a brief self-introduction.
医師は専門医への紹介状を書いた。
The doctor wrote a referral to a specialist.