|Electronic media is the media that use electromechanical energy or electronics for public to access the content. Main resources of electronic media are CD-ROM, online content, slide presentations, audio recordings, video recordings and multimedia presentations. Most of the new media are in the form of electronic media. Analog electronic data or Digital electronic data are two types and electronic media may be in either form.
The impact factor of journal provides quantitative assessment tool for grading, evaluating, sorting and comparing journals of similar kind. It reflects the average number of citations to recent articles published in science and social science journals in a particular year or period, and is frequently used as a proxy for the relative importance of a journal within its field. It is first devised by Eugene Garfield, the founder of the Institute for Scientific Information. The impact factor of a journal is evaluated by dividing the number of current year citations to the source items published in that journal during the previous two years.