Instructor: I have a CLI package on NPM called ElijahManor that prints out information about myself. It's like a really geeky digital business card. Anyway, if I run ElijahManor, you'll notice that I don't have it installed globally.
I can temporarily install it and run it with npx ElijahManor. However, the output is somewhat boring. It's just JSON written to the console. Let's go to our local repo, and navigate to GitHub with npm repo, where you'll see that I've been working on a separate branch called interactive that I'd like to run locally with NPX.
NPX will recognize repos from GitHub, and you even execute individual branches. If I type npx ElijahManor/ElijahManor#interactive, it'll now temporarily download my branch, and run it locally. As you could tell, this version looks a bit more interesting, and you could interact with the options in order to visit various URLs, like my Twitter, for example.
Since I had the repo cloned locally on my computer, I could have run the project from that directory. Using NPX, I could run this experimental branch on any computer, even if the code wasn't already on that machine. Pretty cool.