A man is constantly striving to make his live more convenient and comfortable. Because of this, computer technology is widely come into our lives. The first generation of computers based on vacuum tubes. The founders of computer science are considered as Claude Shannon - the creator of information theory, Alan Turing - mathematician, developed the theory of programming and algorithms, and John von Neumann - by design of computing devices, which still lies at the heart of most computers. In the second generation of computers instead of vacuum tubes used in transistors, and as memory devices have been used magnetic cores and magnetic drums - ancestors of today's hard drives. Today computers are different in size from modern tablets. But the main achievements of this period belong to the field programs. In the second generation of computers was first introduced what today is called the operating system. By the way the operating system of pad is perfect compared to the first system. Computer technologies have been applied in the planning and management, and some large firms, even computerized its accounting. Finally, third-generation computers were first used in integrated circuits - the whole device and units of tens or hundreds of transistors on a single chip made ​​of a semiconductor. Progress in the fourth period is mainly on the development of what has already been invented - primarily by increasing power and miniaturization of components and computers themselves. First appear touch screens. Large computers and supercomputers, of course, by no means died out, and continue to develop. But now they no longer dominate the computer arena, as it was before. Computer technology is increasingly penetrating into the usual domestic sphere of life. Computers are increasingly replacing the usual things to us. For example, electronic books are widely come into our lives. Computer hard to predict the future. For technologies that may exponentially increase the processing power of computers should be assigned the molecular or atomic technology, DNA and other biological materials, three-dimensional technologies, technologies based on photons instead of electronics and, finally, quantum technologies, which use the elementary particles. If on any of these areas can succeed, then computers can become ubiquitous.