Dynamo theory is the scientific framework or theoretical explanation that seeks to elucidate the mechanisms behind the generation and maintenance of planetary or celestial magnetic fields through the dynamo effect. It involves mathematical models and physical principles, considering factors like fluid dynamics, magnetohydrodynamics, and the behavior of magnetic fields within rotating, convecting fluids. Dynamo theory aids in understanding the origin, evolution, and behavior of magnetic fields in celestial bodies, contributing to our knowledge of planetary science, astrophysics, and geophysics.