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Your photo will look like this if you are shooting under tungsten light such as a light bulb and you don’t set your white balance to TUNGSTEN
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Your photo will look like this if you are shooting indoors with a flash and you have set your white balance to DAYLIGHT
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Your photo will look like this if you don’t set your white balance to CLOUDY. This setting adds a little yellow and orange to compensate for the color of this light source
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Your photo will look like this if you don’t set your white balance to SHADE. This setting adds more yellow and orange to compensate for the color of this light source
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Your photo will look like this if you are shooting under fluorescent light, found in most commercial kitchens, if you don’t set your white balance to FLUORESCENT

Custom White Balance adjusts the presumed white point for digital cameras. Aim the camera at a white card and capture the white balance setting so that anything white will be white in your photo. I always set the white balance to manual mode. Often, I create a custom white balance to get better color rendition. Sometimes when using electronic flash, the white balance has to be set manually because the light doesn’t exist until the flash goes off. A setting for daylight is usually close.