troubleshooting Question

How does a website (or podcast) send out notification of updates?

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curiouswebsterFlag for United States of America asked on
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How does a website (or podcast) send out notification of updates?

I have subscribed to a sample podcast and see that I do get alerts (upper right corner of screen) on my MacBook. I have not yet verified those alerts only show up when I have Chrome opened, but that because I always have Chrome open.

Here is what I see under Settings as the Allowed sites.

Screen-Shot-2018-11-26-at-11.48.02-A.png
What is port 443?

Does this mean my port 443 is open to alerts from these two websites?

Please let me know how this works, since I am considering using this for my podcast. Or, if you give me the name of this type of communications, I can look for solutions which I can adopt to have this behavior.

Thanks.
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David Favor
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