Core-collapse refers to the final stage in the life cycle of massive stars, where the core of the star collapses under its own gravity and triggers a supernova explosion. This process is characterized by the rapid collapse of the core, followed by a powerful shock wave that propagates through the outer layers of the star, causing it to explode in a brilliant display of light and energy. Core-collapse supernovae are important astronomical events that play a key role in the production of heavy elements and the dispersal of these elements throughout the universe. Researchers study core-collapse supernovae to better understand the physics of stellar evolution, the formation of neutron stars and black holes, and the impact of supernovae on the surrounding environment.