Simulink is a graphical programming environment used for modeling, simulating, and analyzing dynamic systems. It is part of the MATLAB software suite and allows users to create block diagrams to represent complex systems visually. This makes it easier to design and test algorithms, control systems, and signal processing applications without writing extensive code. With Simulink, users can simulate how a system behaves over time, making it a valuable tool in engineering and research. It supports various applications, including automotive, aerospace, and robotics, enabling engineers to validate their designs and optimize performance before implementation in the real world.