dram consist of only one transistor and then it is a 
volatile memory.it is refreshed periodically otherswise 
stored informations are deleted.
sram consists of five or six transistors and it is also a 
volatile memory, if power is shutoff or rewrite the data 
means already stored informations are deleted.it reqiures 
power continuously.

SRAM (Static RAM)
Data is stored in cross-coupled inverters
Large cell - requires several transistors (6T cell standard)
Fast access time / Low density
Integrates easily into logic fab processes

DRAM (Dynamic RAM)
Data is stored in form of charged capacitors
Small cell - requires one capacitor and one transistor
“Refresh” operation required every few milliseconds
Slower access time but much higher density than SRAM

SRAM
>Short for static random access memory, and pronounced ess-
ram.
>SRAM is a type of memory that is faster and more reliable 
than the more common DRAM
>SRAM's store bits (1's or 0's) in memory cells that are 
basically flip flops.To store 1 bit of information about 6 
transistors are used
>it does not required refreshing
>it is more costlier than DRAM in terms of cost per bit,


DRAM
>DRAM stands for dynamic random access memory, a type of 
memory used in most personal computers

>In DRAM to store 1 bit of information 1 transistor and 1 
capacitor is used.
>The information is stored in the capacitor in form of 
charge, so it required refreshing to retain the charge or 
data in the capacitor.

THE CIRCUIT DIAGRAM OF ALL THE MEMORIES