AP and IB programs both offer rigorous college-level courses for high school students, but they have different structures and requirements. AP courses are individual classes that students can take in a variety of subjects, while the IB program is a comprehensive curriculum that includes coursework in multiple subjects, as well as additional requirements such as the Extended Essay and Theory of Knowledge course. Additionally, AP courses culminate in a single exam at the end of the year, while IB courses have both internal and external assessments throughout the program.