Global health is the health of populations in a global context and transcends the perspectives and concerns of individual nations. Health problems that transcend national borders or have a global political and economic impact, are often emphasized. It has been defined as 'the area of study, research and practice that places a priority on improving health and achieving equity in health for all people worldwide'. Thus, global health is about worldwide improvement of health, reduction of disparities, and protection against global threats that disregard national borders.