Impact Factor is a qualitative and quantitative measure of the frequency with which the average article in a journal has been cited in a given period of time. The impact factor is used as standard dimension and the relative importance of a scientific journal within its field. The Impact Factor is calculated by several scientific methods including citation analysis. There have been many innovative applications of journal impact factors. Impact factor calculation is based on factors like publication quality, peer review, manuscript editing and format quality, website presentation quality, and editorial regularity and data quality. In general, Review articles are cited more frequently than original research articles, as they serve as surrogates of earlier literature.