"Extragalactic" refers to anything that exists outside of our own galaxy, the Milky Way. This term is often used in astronomy to describe objects, phenomena, or regions that are located in other galaxies, which are vast collections of stars, gas, and dust. Astronomers study extragalactic objects to understand the universe's structure and evolution. Examples of extragalactic entities include galaxies, quasars, and nebulae. By observing these distant objects, scientists can learn about the formation of galaxies and the behavior of cosmic phenomena beyond our own galactic neighborhood.