Can I use ionic for website

Can I use ionic as UI of a webiste?
I want to build a website with mobile app can I use Ionic?

Maybe. It’s hard to say more to such a vague question.

If you are asking for web apps then YES!!! Its called PWA, CheckOut Ionic Blog about PWA and CheckOut some cool Demo of PWA build using Ionic

No I need one UI for website and web app.