Spin is an intrinsic quantum property associated with each particle, which is characteristic of the nature of the particle, just like its mass and its electric charge . It allows us to characterize the behavior of the particle under the effect of its rotational symmetry in space.

Spin is indeed a fundamental aspect of quantum mechanics, crucial for understanding particle interactions. It influences phenomena such as magnetism and the Pauli exclusion principle, shaping the behavior of fermions and bosons in our universe.