What Is the Meaning Of the Different Numbers In Bubbles Attached To Dock Icons?

I am wondering why the Chrome icon in the dock has a number in a white circle with a blue ring.
Also my Calendar icon has a number in a red circle … which I know is Siri suggestion, but how do I find what the Siri suggestions are?
I want to know what the numbers mean so that I can look at what they are alerting me to and address whatever that is
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Babs