Colour temperature
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For the purposes of filmmaking, colour temperature is largely used metaphorically. It's a sliding scale of numbers, where 3200 K is the "warm" slightly orange glow of a tungsten electric lamp, and 5600 K is the "cooler" neutral white of sunlight. (The K stands for Kelvins, hinting at physics that you don't need to learn in order to make films.)
In other words, if you want something to look warm, light it slightly orange. If you want it to look cold, light it slightly blue. Set your digital camera's colour balance (or use the appropriate film stock) to expect the neutral 5600 K of natural sunlight, so it doesn't compensate for the effect you want, leaving everything alone.
Lighting: Colour temperature
