1.0 Introduction:In computer terminology, any device used to store data and different applications is called memory. Memory is one of the essential parts of computers or any electronic device. It allows the device to save data and instructions requested by the central processing unit of the CPU. The term memory is usually used to describe a form of fast, temporary storage. In particular, memory is identified by its capacity. The CPU will take a long time to retrieve data without memory, so memory exists so that the CPU can retrieve data faster (Tyson, 2011). This document covers the details of available memory and its capacities and latencies. The article also describes current and historical memory information that will give an idea of ​​the memory requirements for an operating system. Memory 2.0: Memory is the storage space in your computer, where data and instructions are stored. Memory is often provided by magnetic hard drives, floppies, or optical storage devices such as CDs and DVDs. Random access memory (RAM) recalls data only when the computer is turned on, but for flash drive memories it is removable so it does not require power to hold the data (University of Miami). Memory mainly contains three types:2.1 Cache MemoryCache memory is a semiconductor memory that works as a buffer between the CPU and main memory. It can increase the speed of the CPU because it provides data and programs that are used repeatedly by the CPU. Cache memory is usually faster than main memory and requires less access time than main memory. Cache memory has temporary memory and limited capacity.2.2 Primary Memory/Main MemoryPrimary or main memories are essential memories for the computer, which essentially allow it to function. Contains data and...... half of paper....... 2012. An Illustrated History of Computer Memory. Retrieved from: http://www.tomsitpro.com/articles/computer_memory-rdram-sram-punch_card,5-40.html Pingdom. 2008. The history of storing computer data in images. Retrieved from: http://royal.pingdom.com/2008/04/08/the-history-of-computer-data-storage-in-pictures/ Chapin, R. 2009. History of DVD. Retrieved from: http://www.miqrogroove.com/writing/history-of-dvd/ Rouse, M. 2005. Multi Media Card (MMC). Retrieved from: http://searchcio-midmarket.techtarget.com/definition/MultiMediaCard University of Miami. Computer memory. Retrieved from: http://it.med.miami.edu/x983.xml Rampur, S. 2013. Types of computer memory. Retrieved from: http://www.buzzle.com/articles/computer-memory-types.html Ramakrishnan R. Gehrke J. 2013. Memory hierarchy. Retrieved from: http://dblab.cs.toronto.edu/courses/443/2013/02.memory-hierarchy.html