When you "introduce" a person, you explain who they are.
To talk about introducing people, we use the form "Introduce (A) to (B)". It's a little unclear in this situation which person you're talking about, and which person you're talking to. For example:
Have I introduced you to Monica?
This means "Have I explained to you who Monica is?" but it also means "Have I explained who you are to Monica?"
We also use the phrase "Introduce ___ to each other."
I think I'm the one who introduced Bill and Ali to each other.