White Balance in digital photography means adjusting colours so that the image looks more natural. The rage can extend from about 1500K to 27000K or more. White balance is the process of removing unrealistic colour casts, so that the objects which appear white in person are rendered white in your photo.
Examples of White Balance
Best Picture
I think this is my best picture because it is the correct white balance for this image. It has the correct expose and is not bleached out. This image also shows the correct iso.
Worst picture
This is my worst image because it is not the correct white balance, it gives the image a blue look, which in this case, I was not looking for. This image also shows camera shake as you can see a part of an object on the left, lower corner.