he distinction between Science, Engineering and Technology is not always clear. Science is the reasoned investigation or study of phenomena, aimed at discovering enduring principle among elements of the phenomenal world by employing formal techniques such as the scientific method. Technologies are not usually exclusively products of science, because they have to satisfy requirements such as utility, usability and safety. Engineering is the goal-oriented process of designing and making tools and systems to exploit natural phenomena for practical human means, often (but not always) using results and techniques from science. The development of technology may draw upon many fields of knowledge, including scientific engineering, mathematical, linguistic, and historical knowledge, to achieve some practical result Technology is often a consequence of science and engineering — although technology as a human activity precedes the two fields.