What's the "rapid fire?" Is it like a "lightning round?"

Native speaker’s answer
Rebecca
It's similar, yes! "Rapid fire," in its literal sense, means to fire bullets quickly, one after the other. But we also use it to mean speaking unhesitantly and fast. "Lightning round" is mostly used within the contexts of games and contests, but it contains the idea of "rapid fire" to complete things quickly. Ex: We have some rapid-fire questions for you. Ready? Ex: The comedian had rapid-fire delivery. Ex: Okay, contestants, it's time for the lightning round!