Improv vs Sketch vs. Stand-Up; Whats the dif?

I am surprised by the number of actors who are confused by my saying come check out my improv show.
First response is usually something in the area of, “So you’re doing Stand-up at the Improv?”
No, I’m doing an improv show?
Their response, “So, like sketches then…?”

Many actors who aren’t in the comedy world seem to see all three of these very different forms of comedy as one.
I’ll try to make a bit of a distinction here for you.

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