What are 'upper and lower division' college courses?

What are 'upper and lower division' college courses?

Courses are divided into upper and lower division. Typically, courses at a college are numbered from 100 to 499. Courses in the 100 and 200 level series, such as Psychology 101 or Political Science 204 are considered lower division. Lower division courses are numbered from 100 to 299. Upper division courses are numbered from 300 to 499. Typically, upper division courses are more specific in focus and are often courses that are required for your major.