The journal impact factor (IF) is the value of the average number of the citation (cited paper of other authors in the article) of the articles published in the journal (re-evaluated years by years).
It is used as a measured (proxy) of the importance (authoritative) of a journal in its field. If your article will be accepted by an high value IF journal you will add this value to yours academic articles. Note that IF is quite different between discipline (e.g. medicine is higher than engineering).
The journal impact factor (IF) is the value of the average number of the citation (cited paper of other authors in the article) of the articles published in the journal (re-evaluated years by years).
It is used as a measured (proxy) of the importance (authoritative) of a journal in its field. If your article will be accepted by an high value IF journal you will add this value to yours academic articles. Note that IF is quite different between discipline (e.g. medicine is higher than engineering).
The impact factor (IF) of an academic journal is a measure reflecting the average number of citations to recent articles published in the journal. It is frequently used as a proxy for the relative importance of a journal within its field, with journals with higher impact factors deemed to be more important than those with lower ones. The impact factor was devised by Eugene Garfield, the founder of the Institute for Scientific Information. Impact factors are calculated yearly starting from 1975 for those journals that are indexed in the Journal Citation Reports.
The definition of Thomsom Reuteurs
The JCR provides quantitative tools for ranking, evaluating, categorizing, and comparing journals. The impact factor is one of these; it is a measure of the frequency with which the "average article" in a journal has been cited in a particular year or period. The annual JCR impact factor is a ratio between citations and recent citable items published. Thus, the impact factor of a journal is calculated by dividing the number of current year citations to the source items published in that journal during the previous two years.
http://wokinfo.com/essays/impact-factor/
I am totally agree with the definition already given by Dr Croce, but want to add something: be careful some journals have impact factor but are not ISI. This point is very important. As one of my article recently accepted in Impact factor journal, but my institute do not want to pay for me and informed me that this journal is not ISI and is wasteful for our university. TQVM
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