This question is asked by Doreen during our discussion in "Thinking and Philosophy" thread #11, in General Philosophy sub-forum. (http://www.sciforums.com/showthread.php?t=101920) According to definition (from Wikipedia): Problem arises here: "Something not tangible" does not necessarily mean that this thing is not physical: Light is one the most powerful example for intangible physical existence, alongside others such as electromagnetic force and gravity. However software is not a force either. The end result dictates itself as manipulation, arrangement, storage, protocol or direction of data, and necessarily of the physical working mechanism. So it acts like a type of force; not in the sense of physical source though. What is software then? Is it physical; if it is not, what is it? Is DNA code a software too, how about thoughts? Has anyone know any source, got any idea on this issue? I know that term belongs to computers, but I also use it as an analogy for thoughts, that's why I opened this thread under the General Philosophy sub-forum. Yet again, if moderation (this is you glaucon) finds a better place and move it, I will not make any objection.