And more specific definition, science is a system of knowledge depends on the concerted collected on a scientific approach in isolation, or a group of interrelated concepts that we are looking for and we reach by this method . Secede concept of history of science gradually the concept of philosophy, which depends primarily on the thought and contemplation and reflection in the universe and existence through the mind, is characterized in its approach to take notice, and the experience and quantitative measurements and mathematical proofs as a means of nature study, and formulate hypotheses and establish laws and theories to describe them. 
Match the appearance of science with the rise of humanity, and throughout its history has witnessed a series of revolutions and developments through a variety of eras, most notably the one that followed World War II, which make science is divided into several branches or science. Science is classified according to several criteria, they are distinguished by their objectives and curricula and topics to be studied:
* Based on the goals, distinguish the basic sciences (eg physics) and applied sciences (eg medicine),
* According to the curriculum, distinguish science news reporting or experimental (ie, those that rely on observable phenomena, which can test the validity of theories through experience) and abstract science or appropriate (based on abstract concepts and quantities, and the mathematical reasoning - logical).
* By themes, distinguish:
o the natural sciences (physics, chemistry, comprehensive or specialized such as biology or earth science).
o humanities or human rights are taught and their communities (Social sciences) and the economy and self-...
o cognitive sciences such as neuroscience and linguistics and informatics ...
o Engineering Sciences.