>As for IIS, I understand Power BI has some web publishing built-in tools which allow the possibility to negotiate with the web without a web server. I see also it supports the publishing through the generation of iframe HTML code which allows us to insert that code into a web page. When you built that fancy demo, is this the technique you used?

OK, I'll answer your second question first (and it's a good question). There are several options.

Assuming you have some kind of Cloud license like Power BI Pro (which starts at $9.95 a month), if you want to "publish public, to the web", with no expectation of privacy, there are two offerings

- Power BI will generate a long URL string that you can send to anyone (that's the approach I took)
- Power BI can generate iFrame HTML code that you can put into your own web page

Again, I took the first of those. So I didn't build a separate custom web page. I designed the report in Power BI desktop against data I brought down from the NYT.....published the report up to my Power BI Pro cloud site....and then took the option to share the URL for the report with "everyone in the world".

Again, there is no expectation of privacy, so you likely won't want to do that for client data. In the case of my COVID site, that data is all public-domain, so there's no privacy issue.

Now...suppose you want to generate a long URL, but only permit people in your domain to see it.
There is also an option in Power BI cloud, so that you can publish a report with a URL....but only share it with domain users (or use the iFrame HTML code to embed it in one of your domain web pages)

There's no one single website that will explain it all, but this one is a pretty good start:
https://docs.microsoft.com/en-us/power-bi/collaborate-share/service-publish-to-web