Simulations in online training help learners to know about a new process, these simulations can also help learners experiment real-life situations in a virtual environment. Learners here are made to perform an action in a simulated setting in order to get a perfect outcome. Learners can integrate themselves into real-life situations and processes using simulations. Instead of having to go through an ambiguous and challenging content, learners can understand how to work on software or do a process in a simulated environment.
You can include simulations in eLearning courses to engage learners in an interactive environment. Of course, simulations need to be included judiciously depending on the levels of interactions that the course requires.
Here is a presentation showing the significance of simulations in software training; it gives you a brief overview of simulations and the benefits of including them in your online courses.