Universal flash storage is the type of storage that is used in all modern Android phones currently.
UFS4 is truly great & fast, and it's default for all Android flagships since 2023, it is 2x as fast as UFS3/3.1 (2900MB/S compared to 1450MB/S), but there are also 2 lanes of them, therefore, top speed is 5800MB/S.
It is good to see progress moving rapidly. Vivo IQOO 11 was the first phone to introduce universal flash storage 4th gen in Q4 2022. Almost all of it is made by Samsung.