Color (American English) or colour (Commonwealth English) is the visual perceptual property corresponding in humans to the categories called red, blue, yellow, etc. 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 or materials 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.

Colors! is a digital painting application for the Nintendo DS, Nintendo 3DS, PlayStation Vita, iOS, Android, and Windows 8. Originally created as homebrew for the Nintendo DS, it was voted the most popular homebrew application on the Nintendo DS by readers of the R4 for DS blog. The project eventually evolved into an officially licensed application for the Nintendo 3DS, available via the Nintendo eShop, known as Colors! 3D, citing the original homebrew as its beta form. The app, sans 3D, had since been legitimately distributed for Android devices, iOS devices, and PlayStation Vita (via PSN).