Supernova remnants are the leftover remnants of a supernova explosion, which is the violent and catastrophic death of a massive star. These remnants can take on various shapes and sizes, with some appearing as shells or bubbles of expanding gas, while others may manifest as intricate structures such as filaments or loops. Studying supernova remnants can provide important insights into the mechanics of supernova explosions, the dispersal of heavy elements into the interstellar medium, and the formation of new stars and planetary systems. Researchers use a variety of observational techniques, such as X-ray, radio, and optical observations, to study the properties and evolution of supernova remnants. Overall, supernova remnants are crucial in understanding the life cycle of stars, the chemical enrichment of galaxies, and the dynamics of the interstellar medium. They play a significant role in shaping the structure and evolution of galaxies and the universe as a whole.