What is the Difference between a third world country and an advanced country?

Today, the term "third world" is no longer used very much as it has been deemed politically incorrect by many. The term actually originated after WWII, when the Third World referred to countries that were neither communist nor capitalist and were therefore "up for grabs." Many of these countries were in Central/South America, Africa and Asia. As a result, third world is now synonymous with "developing world" or "global south." This basically means that a country has a lower per capita income, and has less developed industries and infrastructure (healthcare, education system, roads, etc.) Many "third world" countries struggle heavily with debt, poverty, and diseases.

The "advanced" countries are generally referring to places like the United States, Western Europe, Canada, Australia, etc. These countries generally have a high per-capita income, developed national industries, high levels of education, higher life expectancy, more civil and political rights and a general higher quality of life.