High Human Development Countries (HHDCs) are nations that score high on the Human Development Index (HDI), which measures factors like life expectancy, education, and income. These countries typically provide their citizens with access to quality healthcare, education, and a high standard of living. Examples of HHDCs include Norway, Switzerland, and Australia. The HDI is calculated by the United Nations Development Programme (UNDP) and helps to assess the overall well-being of a country's population. HHDCs often have strong economies, stable political systems, and effective social services, contributing to their citizens' overall quality of life and opportunities for personal development.