While our eyes can easily adjust to different light sources so that all objects appear as they should, a camera doesn’t necessarily have the same ability. Because of that, your camera will often render the same object differently under two light sources. For example, it will capture a white t-shirt differently indoors under artificial lighting and outdoors in bright sunlight.
This effect is known as “Colour Temperature”, and photographers measure it using the Kelvin (K) scale. To give you an idea of how the system works, use this Kelvin white balance cheat sheet. For reference, daylight comes in at 5,500K. Warmer lighting (such as tungsten) measures at 2,500K to 3,500K, the lower end of the scale. On the other hand, shady conditions have coolerlighting, so they tend to measure between 6,500K to 8,000K.