Static RAM

This type of memory cell is very fast and doesn't need to be refreshed unlike DRAM. It consists of circuits similar to the D flip-flop. It is used to make Cache memory.

How it works

sram_cell.png
A D flip-flop with some modifications is basically an SRAM cell. This can store one bit.
These cells are organized, in say 1 dimension to stack up to form a byte.
sram_cell_stack.png