ROM-( READ ONLY MEMORY)- IS ALSO KNOWN AS A FILMWARE WHICH IS AN INTEGRATED CIRCUIT PROGRAMMED WITH THE SPECIFIC DATA WHEN IT IS MANUFACTURED. ALSO ROM CHIPS CAN BE USED IN ELECTRONICS AS WELL.
http://http://computer.howstuffworks.com/rom.htm
RAM-(RANDOM ACCESS MEMORY)- BASICAALLY YOU CAN ACCESS ANY MEMORY CELL DIRECTLY BUT ONLY IF YOU KNOW THE ROW AND COLUMN THAT INTERSECT AT THAT CELL.
http://http://computer.howstuffworks.com/ram.htm
VIRTUAL- IS A VERY COMMON PART OF THE OPERATING SYSTEMS ON THE DESKTOP COMPUTERS. BY USING VIRTUAL MEMORY THE COMPUTER CAN SEARCH FOR AREAS OF RAM THAT HAS NOT BEEN USED RECENTLY AND COPY THEM ONTO THE HARD DISK. BY DOING THIS IT FREES UP SPACE IN RAM TO LOAD THE NEW APPLICATION.
http://http://computer.howstuffworks.com/question684.htm
CACHE- MODERN COMPUTERS HAVE L1 AND L2 CACHES AND WHICH SOME MAY HAVE L3. THE IDEA BEHIND CACHING IS TO USE A SMALL AMOUNT OF EXPENSIVE MEMORY TO SPEED UP A LARGE OF SLOWER, LESS EXPENSIVE MEMORY
http://http://computer.howstuffworks.com/cache.htm
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