  Socio-economic inequality is characterized from data using various indices.
The Gini ($g$) index, giving the overall inequality is the most common one,
while the recently introduced Kolkata ($k$) index gives a measure of $1-k$
fraction of population who possess top $k$ fraction of wealth in the society.
Here, we show the relationship between the two indices, using both empirical
data and analytical estimates. The significance of their relationship has been
discussed.
