Why are vegetable oils considered healthy compared to vegetable ghee? How are vegetable oils converted into vegetable ghee? Name and define the process involved.

(N/A) $(i)$ Vegetable oils contain unsaturated fatty acids,whereas vegetable ghee contains saturated fatty acids,which are considered harmful to health.
$(ii)$ Vegetable oils are converted into vegetable ghee by the addition of hydrogen in the presence of catalysts such as palladium $(Pd)$ or nickel $(Ni)$.
$(iii)$ The process involved is known as Hydrogenation (an addition reaction). It is defined as the chemical process of adding hydrogen atoms to the carbon-carbon double bonds of an organic compound to convert it into a saturated compound.