You are the organizer of a conference. You are introducing the first speaker. You start by saying "thank you" to the audience for coming. Then, when you're ready for the speaker to begin, you say:
So, I'd like to introduce our first speaker, Tom Johnson.
This is a good way to signal a new "part" of a conversation. In this example, it shows that the general comments about the event are finished and you are now going to start to introduce the speaker.
You use the phrase "I'd like to (do something)" mostly in speeches, or when you're talking with someone like a bank teller or a restaurant host. You don't often use it in face-to-face conversation between people.
You say "I'd like to ___" to let the listener know what your purpose is. For example:
I'd like to introduce our first speaker.
You say this before you introduce him.
I'd like to place an order for delivery.
You say this when you call to order food to be delivered from a restaurant.
When you "introduce" a person, you tell listeners who this person is.
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