Why I can use node.js without settiing environment variable path on windows?

I use windows10.
My node.js’s path is C:\Program Files\nodejs\node.exe and I can use node command.

But I haven’t set my environment variable path.
It does not mean just that I have not set it myself. I checked the user environment variables and the system environment variables but could not find them. (The path of npm was in the user environment variable.)

Why can I use node command without setting path?

Why I can use node.js without settiing environment variable path on windows?