Galactic interactions refer to the gravitational effects that occur when galaxies come close to each other. These interactions can lead to various phenomena, such as the merging of galaxies, the formation of new stars, and the distortion of their shapes. When two galaxies collide, their gas and dust can trigger bursts of star formation, creating new stars in the process. There are different types of galactic interactions, including galaxy mergers and galaxy collisions. These events can significantly alter the structure and dynamics of the involved galaxies. Over time, such interactions can lead to the formation of larger galaxies, contributing to the evolution of the universe.