Afghanistan is very much a developing country or what was once called a Third World country. It is a very poor country whose inhabitants have low life expectancies and little education.
For example, Afghanistan's GDP per capita (a rough measure of how much money is made per person in the country) is only $1,000. For the sake of comparison, this is 212th out of 229 countries listed in the CIA World Factbook. In other words, very few countries are poorer than Afghanistan.
For another example, Afghanistan has an infant mortality rate of 149 deaths per 1000 live births. This is a terribly high number. Only one country in the world has a higher rate.
Please follow the links for much more in the way of statistics on this subject.