For large visible objects like the Earth, spin is the angular momentum of the turning of the Earth around its axis. This tells the amount of rotation that it has. Angular momentum changes with the mass and shape of the object, and with how fast it is turning.
Spin in Quantum Theory[change]
Experiments such as the Stern-Gerlach experiment have shown that sub-atomic particles such as electrons seem to have a north pole and a south pole much like magnets do. Scientists once thought that this was caused by the particle spinning on its axis much like a planet does.
Later, it was shown that the electron would have to be spinning faster than the speed of light to do this. This is why scientists no longer believe that the electron is actually spinning like a planet. Scientists do, however, continue to refer to the magnetic properties of subatomic particles as "spin". Despite the name, no one is entirely sure about exactly what is going on inside the electron that gives it its magnetic properties.
Spin, whatever it is, seems to obey some of the regular laws of angular momentum but not all of them. A "spinning" electron (or any other sub-atomic particle with spin, for that matter) can only have certain values of angular momentum. Electrons can also align themselves against a magnetic field in ways that would be impossible in the everyday world.
But to date, it is also considered the fundamental property of any particle.