Spin angular momentum

Spin angular momentum is a fundamental property of particles, describing their intrinsic, built-in rotation. Unlike objects we see spinning in daily life, particle spin isn’t a literal spinning motion but a quantum property that determines how particles interact magnetically and with other particles. It’s quantized, meaning it comes in specific amounts, often described as "up" or "down." Spin influences magnetic behavior and forms the basis for technologies like MRI and quantum computing. Essentially, it’s an intrinsic form of angular momentum that defines a particle’s magnetic characteristics and quantum state.