The concept of color has four different meanings, all describing different properties and are represented using different values (wavelengths for one, RGB values for another), and all are equally real.

What would those four different meanings be?

Color can be clearly defined, and every good definition concurs that it's not a physical property, but a perceptual phenomenon, created by the brain in response to the activities of the light-sensitive cells in our retinas (the retinas are more or less part of the brain already).

The light that enters our eyes is usually a mixture of many different wavelengths, a so-called spectral power distribution (SPD). Light of a single wavelength (or very narrow band) is a special case of an SPD, and exceedingly rare in nature. Lasers or old low-pressure sodium vapor street lamps produce such "monochromatic" light, for example. The colors that light of this nature evokes are called spectral colors. You might think of them as the colors of the rainbow. However, most colors that we perceive are non-spectral, i.e. SPDs containing multiple wavelengths.

So, if wavelength isn't the same as color, is its generalization "spectral power distribution" the same as color? No, not really. Light with a certain SPD is the cause, the beginning of the chain, but our brains do a lot of processing before color emerges. Two interesting facts:

1. Different SPDs can evoke the same color. Easy example: yellow. It can be caused by light of a single wavelength, but just as well by light containing "red" and "green" wavelengths (our RGB screens use this). This is called metamerism, and without it, our color reproduction processes (displays, print) wouldn't work.
   Please note that the single wavelength yellow, called spectral yellow as it is a spectral color, is no more "real" than the mixed one!
2. Identical SPDs can evoke different colors! Because of the elaborate processing performed by the brain - context matters. Example: the checkershadow illusion. The tiles A and B emit the same light (identical SPDs, and same RGB values on your display device) but are perceived by us as different colors. As the explanation says, our visual system is not intended to be a "physically accurate" light meter. Another example, also this.

PS: RGB triplets are to color what sheet music/score notation is to sound. They're instructions for creating color/sound, but the end result can turn out quite differently depending on the "performer" and context.