Undergraduate education is when you go to school after you finish high school. Just like how you learn different things like math, science, and reading in school, in undergraduate education, you learn more advanced things about those subjects and others too.
When you start undergraduate education, you usually choose a major or a subject that you want to learn more about. Some people like science, some people like English, and some people like music. It's okay to not know what you want to do yet, you can try out different classes and see what you like the most.
During undergraduate education, you go to classes, listen to teachers, and do assignments that help you learn the material. You might also have to take tests to show that you understand what you learned.
Undergraduate education is usually four years long, but some people finish faster or take longer. After you finish, you can get a diploma that proves you completed all the classes and learned a lot. This can help you get a job that requires you to know a lot about your major.