Color or colour (see spelling differences) is the visual perceptual property corresponding in humans to the categories called red, blue, yellow, green and others. Color derives from the spectrum of light (distribution of light power 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. By defining a color space, colors can be identified numerically by their coordinates.
Because perception of color stems from the varying spectral sensitivity of different types of cone cells in the retina to different parts of the spectrum, colors may be defined and quantified by the degree to which they stimulate these cells. These physical or physiological quantifications of color, however, do not fully explain the psychophysical perception of color appearance.
The science of color is sometimes called chromatics, chromatography, colorimetry, or simply color science. It includes the perception of color by the human eye and brain, the origin of color in materials, color theory in art, and the physics of electromagnetic radiation in the visible range (that is, what we commonly refer to simply as light).
Candy, specifically sugar candy, is a confection made from a concentrated solution of sugar in water, to which flavorings and colorants are added. Candies come in numerous colors and varieties and have a long history in popular culture.
The Middle English word candy began to be used in the late 13th century, coming into English from the Old French çucre candi, derived in turn from Persian Qand (=قند) and Qandi (=قندی), "cane sugar", probably derived from Sanskrit word khanda (खण्ड) "piece (of sugar)", perhaps from Dravidian (cf. Tamil kantu for candy, or kattu "to harden, condense"). In North America, candy is a broad category that includes candy bars, chocolates, licorice, sour candies, salty candies, tart candies, hard candies, taffies, gumdrops, marshmallows, and more. Vegetables or fruit, or nuts which have been glazed and coated with sugar are said to be candied.
Outside North America, the generic English-language name for candy is sweets or confectionery (United Kingdom, Ireland, South Africa and other commonwealth countries). In Australia and New Zealand, small pieces of sweet substance are known as "lollies".