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Active Galactic Nuclei (AGN) are some of the most energetic and dynamic objects in the universe. They are found at the center of certain galaxies, where a supermassive black hole, with a mass millions to billions of times that of our Sun, resides. As matter falls into the black hole, it forms an accretion disk that heats up and emits enormous amounts of energy across the electromagnetic spectrum, from radio waves to gamma rays. AGNs are classified into different types based on their observed properties, which can vary depending on the angle at which we view them and the surrounding material. Some of the main categories include quasars, which are extremely luminous and can outshine their host galaxies; Seyfert galaxies, which have bright, compact cores; and blazars, where the jet of material emitted from the black hole is pointed almost directly at us, resulting in intense variability and strong emission. The study of AGNs provides crucial insights into the processes occurring near supermassive black holes, the evolution of galaxies, and the history of the universe itself.