Magnons are collective excitations of electron spins in a magnetic material, often observed in ferromagnets. They represent a type of quasiparticle, which means they behave like particles but are actually a result of the interactions between many particles. Magnons play a crucial role in understanding magnetic properties and phenomena in materials. These excitations can carry energy and information, making them important for potential applications in spintronics, a field that explores the use of electron spin in addition to charge for information processing. Researchers study magnons to develop new technologies that could lead to faster and more efficient electronic devices.