Computer machine is so popular because it can do complex works easily in almost no time ,in an efficient and reliable way.During 1960 computer were used in resarch while it was used by big industries and bussiness houses during 1970s.During 1980s,after the invention of microcomputer(PCs),it has revolutinized the economic and education sectors.This technology envolved as Information Tecnology(IT) from the bigining of 1990s.This IT merged itself to the communication technology to take advantage of communicationtechnology and a new disipline is formed as information and communication tecnology(ICT).Computer are now an essential accessories for most of the organization,office and individuals.It's usages are not limited education,spacescience,economics ,bussiness ,banking,insurance,medicineand healthcare,taspotation,communication,music and entertainment are some of the sector where computer are extensively used .But usages of computer arenot just limited to this sector .
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