The definition of technology is the application of scientific knowledge for practical purposes or applications. Technology uses scientific principles, and applies them to change the environment in which humans live. Technology can also use scientific principles to advance industry or other human constructions. Problems exist in the human environment and have for all of history. The existence of problems is what creates technological advancement; where there is struggle and tension, there is ingenuity and creativity. From this environment comes technology: ways in which the human experience is improved by the invention of objects that solve a problem.