The most basic type of calculus is differential calculus. Differential calculus is concerned with dividing things into smaller parts and understanding how things change over time. Building upon this foundation is integral calculus. With integrals, you can combine an infinite number of small parts to understand the total effects of any number of changes. Furthermore, there are both single variable and multivariable calculus. These types of calculus are as they sound — dealing with a single variable to solve problems or dealing with multiple variables.