3D

Something having three dimensions e.g. width, length, and depth. Three-dimensional space is a geometric model of the physical universe in which we live. The three dimensions are commonly called length, width, and depth (or height), although any three mutually perpendicular directions can serve as the three dimensions.

Color Visual

Color is the visual perceptual property corresponding in humans to the categories called red, yellow, blue and others. Color derives from the spectrum of light (distribution of light energy versus wavelength) interacting in the eye with the spectral sensitivities of the light receptors. Color categories and physical specifications of color are also associated with objects, materials, light sources, etc., based on their physical properties such as light absorption, reflection, or emission spectra.

Colours

Color selection for Website design is a topic that's been approached from many different angles. Some people approach it from a standpoint, explaining how to ensure readability and cross-platform compatibility. Some well-meaning people try to explain that design is all about feelings, describing colors with such hallucinatory delineations as happiness, energy, and stability. Others come to the table with advertising concerns like, "Yellow means cheap, green means money, and black may mean elegance. Have you ever wondered where designers get that mystical ability to say whether a color is or is not "working"? While it's true that sea-foam green doesn't make a good accent for a palette of primary colors, nobody really explains why. Just like having a knack for programming concepts, some natural ability can be advantageous when you're working with color, but most of the skills can be gained from a basic understanding of color theory. Armed with a little knowledge and a few safe rules of thumb, you'll be more dangerous with a palette than a card-counter at a poker table.