|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. Transplantation is the transfer of essential cells, organs or tissues from one location to another with in a same person or from one individual to the other for the purpose of replacing damaged or absent organs in patients. Many of the diseases which will not be readily curable by different types of treatments can be cured by this technique of transplantation. Transplantation technique can be mainly divided into two types called allograft and autograft transplantations. Autograft transplantation is a transplantation which is performed by transferring organs or tissues from one place to other within the same body, whereas allograft transplantation is a transplantation technique which is performed between two different individuals or between two species. There are different types of transplantations where different kinds of organs will act as transplants such as heart, kidney, liver, lung, pancreas, intestine, thymus, bones, cornea, skin, heart valves, nerves and veins. Most commonly transplanted organs are kidneys which are followed by liver and heart. The top open access journals are peer reviewed scholarly journals of transplantation.