AP (Advanced Placement) is a program in the United States and Canada that offers college-level courses and exams to high school students. It allows students to earn college credit or advanced placement in college courses based on their performance on standardized exams. The College Board administers the AP program, which includes a variety of subjects such as AP Calculus, AP Biology, and AP English Literature. Students typically take AP courses in their junior or senior years of high school, and successful exam scores can help them save on college tuition and enhance their college applications.