A blazar is a type of active galactic nucleus that emits powerful jets of particles and radiation. These jets are directed towards Earth, making blazars some of the brightest objects in the universe. They are powered by supermassive black holes at the centers of galaxies, which consume surrounding material and release energy. Blazars are classified into two main types: BL Lacertae objects and flat-spectrum radio quasars. The difference lies in their spectral characteristics and the strength of their emissions. Studying blazars helps astronomers understand the behavior of black holes and the dynamics of galaxies.