What is it for: Calculates the value of an expression as a variable approaches a given limit.

How it works: The concept of a limit is used to determine the value a function takes near a specific point.

Calculation: The behavior of the function near a certain value of x is calculated.

Usage: Essential for mathematical analysis problems, such as calculating derivatives.

Formula: It depends on the function under consideration (e.g. lim(x→a) f(x))