Course
An academic offering defined by a subject code and course number (e.g., ACS 1000). Courses may have multiple sections in a term.
Section
A specific instance of a course offered in a given term, identified by a CRN.
Course Reference Number (CRN)
A unique system-generated identifier for a specific course section in a given term; used for registration and scheduling.
Combined Section
Sections that meet together but retain separate CRNs (may or may not be cross-listed). Combined sections are assigned to the same faculty, meeting pattern and classroom.