Co-simulation in computing refers to a technique in which two or more simulation models are combined to create a more comprehensive simulation. In other words, it is a collaborative simulation process where multiple models are simulated concurrently, allowing the interaction between these models to be analyzed.

Co-simulation is commonly used in the fields of engineering and computer science, where it is used to test and evaluate complex systems that involve multiple components or subsystems. For example, co-simulation can be used to simulate the behavior of a power grid, where multiple models of different components (such as generators, transformers, and transmission lines) are combined to analyze the overall behavior of the system.

Co-simulation requires careful coordination between the different simulation models, and typically involves the use of specialized software tools that can manage the simulation process and handle the data exchange between the different models.