uniti it communicates with input/output devices for transfer of data or results from storage it does not process or store data arithmetic logical unit(alu)it performs arithmetic operations like additionsubtractionmultiplicationand division it performs logic operations such as comparingselectingmatchingand merging of data examples of logic operations are comparisons of values such as notandand or memorymemory is an essential component in any computer memory cell is an individual storage location in memory address of memory cell is the relative position of memory cell in the computers main memory the data stored in the memory cell are called contents of the cell the ability to store programs as well as data is called stored program concept program' instructions must be stored in main memory before they can be executed memory cell is actually grouping of smaller units called bytes byte is the amount of storage required to store single character byte is even composed of smaller units of storage called bit bit refers binary digit binary refers to number system based on two numbers and therefore bit is either or there are eight bits in byte main memorystores programsdata and results random access memory(ramramo offers temporary storage of programs and data while the programs are temporarily being executed by the computer ram is usually volatile memorywhich means that everything in ram will be lost when the computer is switched off accessible to the programmer department of csevishnu institute of technology