Nearly all light sources emit a level of luminosity and a colour. In assessing a scene, or subject, your camera sensor attempts to color correct, or “normalize” colours. These different colour dominants can be defined by using a scale which measures temperature in Kelvin.
Your camera, at times, will be be challenged by different light sources and because it is unable to color correct accurately it needs your help. This is where you can use the camera White Balance pre-sets (settings) which correspond to a particular colour, or light temperature. While this may not achieve 100% satisfactory results you will see, in most cases, a great improvement.
Two different White Balance settings taken within a few minutes of each other with minimal change in the evening light.