* No formal education: A person who has not completed any formal schooling.
* Primary school/Elementary school: Completion of elementary level education.
* Secondary school/High school/GED: Completion of high school or its equivalent.
* Associate's degree: A two-year college degree.
* Bachelor's degree: A four-year college degree.
* Master's degree: A postgraduate degree requiring further study beyond a bachelor's degree.
* Doctoral degree (PhD, EdD, etc.): The highest academic degree usually requiring significant research and a dissertation.
* Professional degrees (MD, JD, etc.): Specialized degrees in fields such as medicine or law.
Educational attainment is often used as an indicator of socioeconomic status, potential earnings, and overall societal well-being. It's a key metric in various studies and analyses relating to population demographics, economic development, and social mobility.