Memory is a unit area where small size as well as large amount of data can be stored for temporary or permanent time period. Some types of memory store data without using any power backup and some type of memory require power supply. Similarly some memories are essential to run computer system while others are required for only data storing depending on their nature. Memory is classified into two types. Those are:
1) Primarymemory: They are essential memory to run a computer system which store small size of data temporary period with the help of power backup. Those types of memories are required while booting the computer system. If the power supply is stopped all the data stored in primary memory are lost. So, these types of memories are called primary memory. For example: RAM and ROM.
2) Secondarymemory: Those memories which are used to store data and programmes for further use i.e. for permanent time period without any power backup. Those types of memories are not essential to run computer system. So, they are called secondary memory or auxiliary memory. For example: Hard-disk (HDD), Pen drive etc.
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