Introduction to Science

The word "Science" is derived form the Latin (Roman) word 'Scientia' or 'Scire' which means knowledge. Science deals with the understanding of phenomena and the relation between them and its end is the rational interpretation of facts of existence as disclosed to us by our faculties and senses. The hypotheses of Science, according to a great thinker, Karl Pearson are formed on the basis of the observed facts, which, when confirmed by criticism and experiments are turned into the "Law of Nature" . 

The Definition of Science
Science is not merely a collection of facts, concepts, and useful ideas about nature, or even the systematic investigation of nature, although both are common definitions of science.
Science is a method of investigating nature--a way of knowing about nature--that discovers reliable knowledge about it.In other words, science is a method of discovering reliable knowledge about nature. There are other methods of discovering and learning knowledge about nature (these other knowledge methods or systems will be discussed below in contradistinction to science), but science is the only method that results in the acquisition of reliable knowledge.

Reliable knowledge is knowledge that has a high probablility of being true because its veracity has been justified by a reliable method.Reliable knowledge is sometimes called justified true belief,to distinguish reliable knowledge from belief that is false and unjustified or even true but unjustified. (Please note that I do not, as some do, make a distinction between belief and knowledge; I think that what one believes is one's knowledge. The important distinction that should be made is whether one's knowledge or beliefs are true and, if true, are justifiably true.) Every person has knowledge or beliefs, but not all of each person's knowledge is reliably true and justified. In fact, most individuals believe in things that are untrue or unjustified or both: most people possess a lot of unreliable knowledge and, what's worse, they act on that knowledge! Other ways of knowing, and there are many in addition to science, are not reliable because their discovered knowledge is
not justified
. Science is a method that allows a person to possess, with the highest degree of certainty possible, reliable knowledge (justified true belief) about nature. The method used to justify scientific knowledge, and thus make it reliable, is called the scientific method.