White balance is used to adjust colors to match the colour of the light source so that white objects appear white. Subjects may be lit by a number of different light sources, including sunlight, incandescent bulbs, and fluorescent lighting. When on a DSLR (digital single-lens reflex) camera you can select one of the following presets - Custom, Kelvin, Tungsten, Fluorescent, Daylight, Flash, Cloudy and Shade.
Different times of day and light sources create different color temperatures. Light is measured in kelvins and neutral light is produced at 5000K (kelvins), the equivalent to a bright, sunny day.
On a DSLR camera there is an auto mode under white balance where the camera produces good pictures as the camera decides where the composition of the camera would look best. Full manual mode is where the user has full control of the image temperature and the result of the picture. When you are taking images, the photographers aim is to get the most realistic and accurate as possible.
For the last 3 photos I used auto so that the photos would come naturally. On the first 3, I used daylight for a bit more light.