The person who makes introductions briefly holds two separate worlds in the same sentence.

Introducing two people means holding two separate worlds together in one sentence. You know what each of them will not know, and how you describe each one shapes what they become to each other. It is a small act of authorship carried out in a few seconds.

Do it deliberately rather than mumbling names. Give each person something the other can use, ideally the thing you actually admire about them. It takes an extra breath and it makes the conversation that follows possible. Being good at introductions is an unglamorous social skill with a disproportionate effect on how connected the people around you become.