Final answer:
Developed countries are nations with high wealth, advanced infrastructures, and high living standards, such as Canada and Japan. They are differentiated from less-developed countries that have lower levels of wealth and are often found in central Africa, South America, and certain island nations.
Step-by-step explanation:
Developed countries are nations that are considered industrialized, economically stable, and have high standards of living. Examples of these countries include Canada, Japan, and Australia. They are characterized by high wealth, advanced technological infrastructure, and higher levels of income among their populations.
After World War II, countries such as Germany, France, and Japan rapidly rebuilt their economies, later followed by others like Singapore, South Korea, and Taiwan during the 1960s and 1970s, leading them to be categorized as developed nations. These countries often have higher productivity and a fairly even distribution of individuals in all age groups which is indicative of stable demographic indicators.
In contrast, less-developed countries have less wealth to distribute among their populations and are typically found in regions such as central Africa, South America, and certain island nations. These countries are still progressing in terms of their economic, mortality, and demographic indicators.