Answer:
Whenever you want to zoom and enlarge a photo so you can see details, you are using a dilation transformation.
At eye exams, the pupil dilates (widens), allowing in more light and giving your doctor a better view of the back of your eye.
When you build model airplanes, cars, or buildings that are true in scale and measurement, you are performing a dilation.
And even your shadow is a dilation as well.
Explanation: