Safari 26 brings a smoother app-like experience to many websites on your iPhone...

https://dibz.me/blog/what-is-the-difference-between-a-pwa-and-just-a-site-added-to-home-screen-1273

Safari 26 brings a smoother app-like experience to many websites on your iPhone and iPad. When you save a site to your Home Screen, it opens cleanly without the usual browser bars getting in the way