A digital differential analyzer (DDA) is a computerized system that is designed for solving differential equations. It functions by computing the numerical values of the derivatives of a function at predetermined intervals. There are a few synonyms for DDA, including digital integrator, numerical integrator, and digital calculus machine. These systems are utilized in a wide range of industries and disciplines, including engineering, physics, biology, and finance. Digital integrators are useful in simulation systems because they allow for the computation of large sets of differential equations, which can be challenging or impossible to solve using traditional calculus methods. In summary, digital differential analyzers are an essential tool in modern computing and scientific research.