What do you mean by growth of population? How is it calculated?

Growth of population or population growth refers to the change in the number of inhabitants of a country during a specific period of time, say during the last ten years.
It can be expressed in two ways:
(i) Absolute Numbers: Itis obtained by simply subtracting the earlier population from the later population. It is referred to as the ‘absolute increase’.
(ii) Annual growth Rata: when the rate or pace of population is studied in per cent per annum. If increase is 2 percent, i.e., there was an increase of two persons for every 100 persons in the base population. This is referred to as the annual growth rate.