A developing country, also called a less-developed country, is a nation with a low living standard, undeveloped industrial base, and low Human Development Index relative to other countries.
Definition
Kofi Annan, former Secretary General of the United Nations, defined a developed country as follows. "A developed country is one that allows all its citizens to enjoy a free and healthy life in a safe environment." But according to the United Nations Statistics Division,

And it notes that

The UN also notes

The World Bank classifies countries into four income groups. These are set each year on July 1. Economies were divided according to 2011 GNI per capita using the following ranges of income:
Measure and concept of development
The development of a country is measured with statistical indexes such as income per capita, life expectancy, the rate of literacy, et cetera. The UN has developed the Human Development Index, a compound indicator of the above statistics, to gauge the level of human development for countries where data is available.
Developing countries are, in general, countries that have not achieved a significant degree of industrialization relative to their populations, and have, in most cases, a medium to low standard of living. There is a strong correlation between low income and high population growth.
The terms utilized when discussing developing countries refer to the intent and to the constructs of those who utilize these terms. Other terms sometimes used are less developed countries, least economically developed countries, "underdeveloped nations" or Third World nations, and "non-industrialized nations". Conversely, developed countries, most economically developed countries, First World nations and "industrialized nations" are the opposite end of the spectrum.
To moderate the euphemistic aspect of the word developing, international