Since the invention of the integrated circuit, there has been a need to find a way to read and perform certain actions based on, the state of these circuits. These instructions are distinguished from the circuits themselves (called hardware because of their physical reality) and the instructions that control them (called software because it has no physical presence and can be changed to perform a different function).

A software development company uses computers based on these original circuits (now in highly dense and complex configurations) to produce, or develop, software that can perform an incredible array of functions ranging from adding a few numbers on a calculator to producing 3D animations that are so lifelike it is almost impossible to distinguish them from real life

Fundamentally, these companies produce digital solutions to (any conceivable) real-life problems that a human can have by instructing circuits to have a value of either 1 or 0.