A population or demographic pyramid as they are known, is a type of history or histogram where the constant variables of certain characteristics of a given population are graphed, which is displayed with horizontal bars where the length is proportional to the quantity, the age, the sex of the people who inhabit it, and they are represented in each of the bars, thus calculating the progressive increase of it.
A progressive population pyramid has a pagoda shape, where its base is represented wider with a decreasing ascent, that is, at its top it is narrower or the information is reduced, thus representing the youngest population in growth and with a high birthrate, this is read as information towards the future of rapid expansion or demographic growth, thus giving the typical model of a country in constant or underdeveloped development.
This type of pyramid shows the levels of fertility and mortality levels, a nation full, these data may be accurate or just give a margin of Assertive percentage of proven information, which help to make comparisons with other nations such as the rate of longevity and why this over others, so we can determine the kind of life which remain to this sector with more time of life and the kind of stability that gives security growth in new generations.
By being able to carry out such structured studies of a country or population, appropriate comparisons can be made at a global level to have as references what is happening in the present, as well as what has happened in the past, in order to define a possible present in the near future; taking into account that its purpose in showing the existence, weaknesses and strengths of both sexes, reflecting which type of population predominates more, among the young, the adult, the elderly, man or woman, classifying what is known as the incoming and the salients as an uncontrolled phenomenon indicating their influence on the population, such as migrations, wars or some kind of disease turned into an epidemic causing maximum deaths, in order to arrive at an apparently reliable record and its possible comparison with the rest of the world.
