@milky_bar_may
Sorry to hear that you didn't get any response...this is the best place to get questions answered.
And here is what I can tell you:
1: Can a PowerApp be hosted on a company website (and visitors to the website can use the app without registration or impediment?)
No. PowerApps needs to run in the PowerApp player. This is either an App on a device or through the interpretive environment of the player in a browser. You can link to a PowerApp, but that simply starts the Player with the app.
However, the more important point is that all users of the App need a license to use it. So this rules out visitors.
2: Is it possible to track usage metrics of a PowerApp (whether it is used on a website or from the PowerApp website?)
Yes, there are many metrics that can be gathered from an app, but all in context of the App running in the player (app or browser).
3: If I want to capture data that someone using the app enters, is there a way of creating a database of this information?
Yes, putting information into a database and interacting with data is what PowerApps is all about (mostly). In regard to metrics, the best answer on that is using Application Insights. It maintains all the metrics of the app and stores information about it in its own database. Now, that is metrics, not data. If you are wanting to use and store data, that is what you design your App to do.
Other options that might be of interest to you would be the PowerPlatform Portals for serving external users or visitors.
I hope this is helpful for you.
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