How can I use this? I see stuff like importing directly from a CDN? What does that mean? I could just call `import` in my source JavaScript without transpiling?

How can I use this? I see stuff like importing directly from a CDN? What does that mean? I could just call `import` in my source JavaScript without transpiling? I also see `npm install` stuff, so what's the difference? I'm interested in importing packages directly instead of transpiling stuff in some cases, but I don't see how would that work.