Different light sources have different color temperatures as described here https://www.artlook.us/service/gay-wedding-photographers-nyc/. The temperature of light is measured in kelvins, for example, the temperature of an incandescent lamp is 3200K, and the temperature of the sun is 5200K.
White balance is abbreviated as WB. The white balance setting allows you to set the temperature that the light source has when shooting. As a rule, the automation of the camera copes well with this.
It is worth bothering only when different light sources shine. For example, at the same time incandescent lamps and fluorescent lamps. In this case, the CZK has the function of setting the white balance on a white sheet of paper. You need to take a white sheet of paper and do as it is written in the instructions of the Central Control Commission. If you set the white balance incorrectly, the colors in the photo will be distorted.
Modern CZKs allow you to take photos in RAW format. In this format, you can correct the white balance and many other parameters in the editor without losing the quality of the photo, and then convert to JPG.