What is the difference between Polygon and ZK Polygon?

Excuse me, could you please elaborate on the distinction between Polygon and ZK Polygon? I'm trying to grasp the nuances of these two platforms and understand how they differ in terms of functionality, purpose, and their impact on the broader blockchain ecosystem. Could you walk me through the key features and advantages of each, as well as any potential limitations or considerations I should be aware of? Thank you in advance for your insights.