Types of Computer Memory:

• Essential Memory Types: RAM and ROM : 
• There are two key types of essential memory: 

     1. RAM, Random access memory 
     2. ROM, or read-only memory 

     1) RAM  Memory: 

• RAM stands for Random Access Memory. RAM is a hardware device of computer. It is also known as main memory and primary memory.Ram allow data to be stored on computer system and retrieved whenever required. It is also known as temporary memory because it store data temporarily. Data stored in RAM will be lost when electricity has gone.It works still computer on. It is also called volatile memory e.i. temporary memory.

• Types of RAM: 
• DRAM:It represents Dynamic RAM, and it is the most widely used type of RAM. It is type of RAM memory.DRAM store each bit of information on a single capacitor. It is most widely used way to store information because it needed less space of memory to store information. There is a another type of RAM e.i SRAM(Static Random Access Memory). DRAM can store more data than SRAM and DRAM also require more electricity than SRAM memory. DRAM memory is less expensive than SRAM memory. DRAM also have different types like SDRAM.                                 

• SRAM: SRAM represents Static RAM. Static Random Access Memory is also a type of RAM that can store information in the form of static. SRAM store information on transistors using inverters. SRAM can store one bit of information using six metal oxide semiconductor field. MOFSET is a type of SRAM memory. SRAM memory can work at higher speed than DRAM memory.It is available in hard disk as a disc cache.
• The key contrasts among DRAM and SRAM is that SRAM is quicker than DRAM - maybe a few times quicker - yet increasingly costly and bulkier. SRAM is normally accessible in megabytes, while DRAM is bought in gigabytes. 

      2) ROM Memory: 

• ROM represents read-only memory, and the name originates from the way that while information can be perused from this sort of PC memory, information can't typically be kept in touch with it. It is a quick kind of PC memory which is typically introduced near the CPU on the motherboard. 

• Types of ROM: 

       ROM can be classified into following category;
          1. PROM,
          2. EPROM,
          3. EEPROM. 

• PROM: It stands for Programmable Read-Only Memory. It has computer configuration information.It is also known as permanent electronic memory. It is used for rewritable disks. PROM writes by electric pulses.

• EPROM: It stands for Erasable Programmable Read-Only Memory, and as the name proposes, information put away in an EPROM can be erased and the EPROM can rewrite. Deleting an EPROM includes expelling it from the PC and presenting it to bright light before re-consuming it. 

• EEPROM: It stands for Electrically Erasable Programmable Read-Only Memory, and the differentiation among EPROM and EEPROM is that the last can be erased and written. It can remove data electrically. In that sense EEPROM isn't carefully perused as it were. Anyway by and large the compose procedure is moderate, so it is typically just done to refresh program code, for example, firmware or BIOS code on an incidental premise. 

      Contrasts among RAM and ROM:  
      ROM: 

• Non-unpredictable 
• Quick to peruse 
• Normally utilized in little amounts 
• Can't be composed to rapidly 
• Used to store boot directions or firmware  

       RAM: 

• Volatile: 
• Unpredictable 
• Quick to peruse and compose 
• Utilized as framework memory to store information (counting program code) that the CPU needs to process inevitably 
• Generally modest per megabyte put away contrasted with ROM, however moderately costly contrasted with optional memory.