There are two basic types of RAM; DRAM (Dynamic RAM) and SRAM (Static RAM). DRAM is the most common and least expensive computer memory. SRAM works on the principle of a switch that is turned on or off and requires 2 to 4 transistors for each bit (a bit has two states; on or off and is the smallest unit of memory storage and is made of one memory cell). DRAM, on the other hand, is based on a capacitor's ability to hold a charge and requires only one transistor per bit. Because DRAM cells are smaller than SRAM, manufactures can put more memory into the same size thus reducing the cost per bit. Let us explore how the popular DRAM works.