Spin is a form of angular momentum for subatomic objects. The weird thing about spin is that quantum mechanics does not require its structures to rotate in order for them to actually posses a form of angular momentum. This is why electrons or other fundamental particles are not rotating even tho they posses spin. Electrons are assumed to be point like structures so they do not posses a conventional volume and if it is actually true that they are points in space this could explain why they do not rotate even tho having angular momentum. This can be tricky to measure however because of the Heisenberg uncertainty principle. For now we assume that spin is a form of angular momentum in the quantum realm and it can take only discrete values. It is represented as an orientation of a spin vector kind of like (anti)clockwise vectors that could be drawn to represent the orientation of angular momentum. It is also assumed that this property of having angular momentum while not rotating is attributed as a weird feature of quantum theory and not to the point like assumption of subatomic particles. The particles which have spin in multiples of 1/2 are called Fermions(what stuff is made of) while particles who have integer multiples of spin are called Bosons (force carrying particles).
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