What’s an ingredient you see on food labels but have absolutely no idea what it does?

I’ve started reading ingredient lists more closely, and honestly, half the time I end up Googling ingredients I’ve never heard of.
Some names sound scary, some sound completely harmless, and sometimes I have no idea which is which.
So I’m curious:
What’s one ingredient you’ve seen on a food or drink label that you’ve always wondered about?
Drop the ingredient below. Let’s see how many we can decode together.