Computer software, or simply software, also known as computer programs, is the non-tangible component of computers. Computer software contrasts with computer hardware,
which is the physical component of computers. Computer hardware and
software require each other and neither can be realistically used
without the other.
Computer software includes all computer programs regardless of their architecture; for example, executable files, libraries and scripts
are computer software. Yet, it shares their mutual properties: software
consists of clearly-defined instructions that upon execution, instructs
hardware to perform the tasks for which it is designed. Software is
stored in computer memory and cannot be touched, just as a 3D model shown in an illustration cannot be touched.[1]
At the lowest level, executable code consists of machine language instructions specific to an individual processor – typically a central processing unit (CPU). A machine language
consists of groups of binary values signifying processor instructions
that change the state of the computer from its preceding state. For
example, an instruction may change the value stored in a particular
storage location inside the computer – an effect that is not directly
observable to the user. An instruction may also (indirectly) cause
something to appear on a display of the computer system – a state change
which should be visible to the user. The processor carries out the
instructions in the order they are provided, unless it is instructed to
"jump" to a different instruction, or interrupted.
Software is usually written in high-level programming languages that are easier and more efficient for humans to use (closer to natural language) than machine language.[2]
High-level languages are compiled or interpreted into machine language
object code. Software may also be written in a low-level assembly language, essentially, a vaguely mnemonic representation of a machine language using a natural language alphabet. Assembly language is converted into object code via an assembler.
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