3D NAND is a type of flash memory technology that stacks memory cells vertically in multiple layers. This design allows for greater storage capacity in a smaller physical space compared to traditional 2D NAND, which arranges cells in a single layer. By increasing the number of layers, manufacturers can produce more efficient and faster storage solutions. The vertical stacking of cells in 3D NAND also improves performance and endurance. It reduces the distance data must travel, leading to faster read and write speeds. Additionally, this structure helps minimize interference between cells, enhancing reliability and longevity, making it ideal for devices like smartphones and solid-state drives (SSDs).