Multi-level cell (MLC) and single-level cell (SLC) refer to how NAND flash memory chips store data.
In an SLC chip, one cell stores one electrical charge representing one bit of information.
The MLC chips take this a step further.
They vary their voltage levels to store up to 2 bits of information in one cell.
V in 3D V-NAND stands for vertical.
It is newest technology of NANF Flash memory with stacking cells vertically.
It improves performance and endurance than conventional 2D Planar NAND.