Photon is the light particle. The way light travels (as sound, for example, does) is called a wave (motion). You may have heard of the sinal wave and that it represents the travel (motion) of sound? Sinal wave, mathematically, is the curve which results when you plot trigonometric function (y) = sin (x) in an orthogonal coordinate system. The variances in wave motion are, then, represented by different amplitude, frequency and wavelength. Our eyes perceive colours based on the wavelength light reflects and refracts from the object we're observing, for example. Our eyes contain receptor cells for basic colours and our brain interprets the observed wavelength(s) of light which enables us to see colours. PS: you may also have heard that "light travels straight". This is, practically, true, however the motion of light is still represented as a wave. But of one, of course, whose amplitude approaches zero.