It is the set of instructions that describe a task to perform, ie computer programs, which are introduced into the computer, that intangible you can not see but that makes the Hardware has reason to be.
A program is nothing more than a set of written instructions and data so as to be understood by the computer.
OPERATING SYSTEM
The computer, as a mechanical element, uses a language based on electrical signals. This language, called machine language or machine code, is hardly manageable by the user, since it only consists of zeros and ones, and you need to be an expert to compose combinations of zeros and ones such that mean something to the computer .
The machine language is called low level language because coding is at the level understandable by machine and not by us. There, so-called high-level languages that are closer to our language (usually English) to the machine code.
Although the computer operation can produce the illusion of running our instructions in a high level language, the reality is that the CPU just runs an extensive program built into machine code which mediates (the term is usually used Interface or Interface) between the user and the CPU. This program is called the Operating System (OS) or Operating System (OS).
TYPES OF OPERATING SYSTEM
There are many operating systems, considering that depending on the type of computer (great computer, mini computer or microcomputer). needs are very different. in the case of micro computers the most used operating systems: MS-DOS, OS / 2, WINDOWS, WINDOWS NT, UNIX, LINUX.
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