UFS Universal Flash Storage
The flash storage standard in modern smartphones — successor to eMMC, much faster.
JEDEC spec, 2011. Uses SCSI architecture with a full-duplex serial link instead of eMMC's parallel bus. UFS 4.0 (2022) hits 23.2 Gbps — on par with PCIe NVMe SSDs. Default storage in Samsung Galaxy, OnePlus, Xiaomi top-tier phones since ~2018. iPhones use Apple's own NVMe implementation instead.