h index is the largest no. of h such that h publication have at least h citation Eg an h-index of 10 tells us that an author has written 10 papers which have each been cited at least 10 times. i10 index is the no. of publication have at least 10 citations. The h-index is short for the Hirsch index, which was introduced by Jorge E. Hirsch (2005) as a way to quantify the productivity and impact of an individual author  While the Impact Factor is derived from the quotient of total citations and total papers in a two-year span.