Is Sine Wave just a graph of particles that do SHM? A wave on a string is also a Sine wave provided its particles are moving sinusoidally. But its shape also kind of represents a sine wave. So is the wave on a string called a sine wave because of the physical shape that we can see or because of its Graph? Or What is a Sine Wave? Does it represent the shape of a Wave or is it just the graph of oscillating particles as a function of time?