Is scroll a zk rollup?

Excuse me, but could you please clarify something for me? I've been reading about ZK rollups and I came across the term "scroll." Now, I'm wondering if "scroll" is actually a type of zk rollup or if there's some sort of misunderstanding here. Could you elaborate on the relationship between the two, if any? I'm trying to get a better understanding of how zk rollups work and the various terms associated with them. Thank you in advance for your help.