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This essay sheds light on what is population growth, demystifies what causes the occurrence of population growth in a population, and delineates the benefits of the occurrence of population growth in a population. Succinctly stated, population growth is a term that delineates an amplification in the size of a population. An amplification in the size of a population transpires when the new members of a population are born at a higher rate than the rate at which the members of a population pass away at. The natality-to-mortality ratio refers to a ratio that states the birth rate of a population to the death rate of a population amid a specific time period. A high natality-to-mortality ratio denotes that a population has more of its members being born than passing away, whereas a low natality-to-mortality ratio denotes that a population has more of its members passing away than being born. Furthermore, a high natality-to-mortality ratio also denotes that a population is increasing, whereas a low natality-to-mortality ratio denotes that a population is decreasing. The rate at which a population amplifies at is predicated upon the rate at which the new members of a population are born at and the rate at which the members of a population pass away at. It is desirable for a population to have a natality rate that is high enough to surpass its mortality rate. A significant amplification in the quantity of the members of a population being born can have bearing on helping a population to attain a high natality-to-mortality ratio. Furthermore, a significant amplification in the average life expectancy of the members of a population can also have bearing on helping a population to attain a high natality-to-mortality ratio. A significant decrease in the mortality rate of a population coupled with a significant increase in the natality rate of a population is conducive to helping to facilitate population growth in a population.