computer is a big discovery in the world. first time computers is using for only mathematical calculation.that time build computer using vacuum tubes. that computers very big. that have only small storage space.. eniyac ed sac it the example for that time computer. but now computer is big world about knowledge and good or bad thinking. today's computers is highly capacity systems . computers are many types. desktop laptop .server system.....etc. most time we using system is laptop.laptops are many types. and many company's have different model laptops
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