The term software includes all programs that are used for data processing. The software will include also used to control various parts of the hardware. The term has been in the late 50s in circulation. The official definition is that the software is the Gegenworte to the hardware. The so-called hardware but provides the framework, without which no software could start its work. From the physical perspective is also claimed that the so-called software does not exist, since it is made in contrast to the hardware, not from certain materials. To imagine to how the software work, we could install an alternative operating system to hardware, so the PC. So that you can clearly see that the PC reacts differently and that with equal-lasting hardware. The software has to be invisible, other properties besides the fact. It should be mentioned for example, that software does not wear after extended use adduced. The computer programs are also extremely flexible. So they are correctable, you can update and expand it. If the various software developed only once, it can be copied without the big prize effort, which ensures that the company be continuously supplied with new software or so-called update, you can.