Precalculus with limits is a high school math course that covers topics in algebra, geometry and trigonometry and prepares students to study calculus. Students often take this course as juniors or seniors in high school.
Precalculus teaches students to work with the mathematical functions that must be understood to learn calculus. Because limits are an essential foundation of calculus, a precalculus course that includes the study of limits better prepares a student than a course that omits this topic.
The limit of a function at a point is the value that the output of the function comes close to as the input of the function approaches that point. A rigorous definition of a limit is known as an epsilon-delta definition.