GarlicSim is an ambitious open-source project in the field of scientific computing, specifically computer simulations. It attempts to redefine the way that people think about computer simulations, making a new standard for how simulations are created and used. GarlicSim is a platform for writing, running and analyzing simulations. It is general enough to handle any kind of simulation: Physics, game theory, epidemic spread, electronics, etc. You may be wondering, what do these simulations have in common? We'll try to answer this question in this lecture. We will see examples of some simulations in GarlicSim and the tools that it provides for running and analyzing them.