RAM (RANDOM ACCESS MEMORY)

RAM means Random Access Memory which allow you to randomly and quickly access any location in memory.

DRAM (DYNAMIC RANDOM ACCESS MEMORY)

Dynamic RAM is the type of memory chip used for most of the main memory of the modernPC. The main advantages is that it can contain a lot of bit in single chip and it is very inexpensive which makes it affordable for large amount of memory users.

The memory cell in DRAM are tiny capacitors that retain charges to indicates a bit. The problem of DRAM is that is dynamic , and because of the designed must be constantly refreshed constantly or the electrical charges in the individual memory capacitors will drop and the data lost.

SRAM (STATIC READ ACCESS MEMORY )

This is otherwise known as cache memory a distinctly different type of memory that is significantly faster than most types of DRAM. SRAM stands for static RAM, which is so named because it does not need periodic fresh rates like DRAM. SRAM is must faster than DRAM and is fully able to keep pace with modern processors.

SRAM memory is available in access times of 2ns or less, which means it can keep pace with processors running  500MHZ or faster. As long there is power, SRAM will remember what is stored.