This paper discusses philosophy of technology as a critical, reflective examination of the nature of technology as well as the effects and transformation of technologies upon human knowledge, activities, societies and environments (Umwelt). The aim of philosophy of technology is to understand, evaluate and criticize the ways in which technologies reflect, as well as change the human life individually, socially and politically.Secondly, philosophy of technology is closely related to the philosophy of science, which offers much attention to the methodology and epistemology. Thirdly for Husserl, technique “is a mere art of achieving technical rules”, but for Heidegger it is merely in bringing out the meaning of technology. Finally, theories supporting technology are explained: such as common sense theory, theory of truth or theory of pragmatism, theory of epistemology, and theory of experience. Thus, the traditional values of knowledge, instruments, techniques and tools used in an ancient society epitomizes mankind from its earliest days as it was used by engineers in the modern world or when engineers aligned themselves with science in regularly applying scientific knowledge to technical practice in our everyday life.