The MIUI ROM is a very heavily modded Android interface that is suppose to show some similarities to iOS, with one example being the lack of an app drawer. The MIUI ROM offers a brand new experience compared to the regular stock Android UI.
Also for those people who don’t want commit to the MIUI ROM, MIUI has released a custom launcher, called MiHome launcher, which makes it look like the phone is running MIUI. That way users can experience MIUI, while running their stock ROM or a different ROM altogether. The MiHome launcher probably helps convert people on over to the MIUI rom.
It’s great to see such a wonderful ROM gain so many users all around the world. Do you run MIUI on your phone?