Simulink, developed by MathWorks, is a commercial tool for modeling, simulating and analyzing multidomain dynamic systems. Its primary interface is a graphical block diagramming tool

Visual modeling

Visual modeling is the graphic representation of objects and systems of interest using graphical languages. Visual modeling languages may be General-Purpose Modeling languages or Domain-Specific Modeling languages...

 and a customizable set of block libraries

Library (computer science)

In computer science, a library is a collection of resources used to develop software. These may include pre-written code and subroutines, classes, values or type specifications....

. It offers tight integration with the rest of the MATLAB

MATLAB

MATLAB is a numerical computing environment and fourth-generation programming language. Developed by MathWorks, MATLAB allows matrix manipulations, plotting of functions and data, implementation of algorithms, creation of user interfaces, and interfacing with programs written in other languages,...

 environment and can either drive MATLAB or be scripted from it. Simulink is widely used in control theory

Control theory

Control theory is an interdisciplinary branch of engineering and mathematics that deals with the behavior of dynamical systems. The desired output of a system is called the reference...

 and digital signal processing

Digital signal processing

Digital signal processing is concerned with the representation of discrete time signals by a sequence of numbers or symbols and the processing of these signals. Digital signal processing and analog signal processing are subfields of signal processing...

 for multidomain simulation and Model-Based Design.
A number of MathWorks and third-party hardware and software products are available for use with Simulink.