Feng Shui means the Wind and Water. When wind and water combines, they form energy which the Chinese refers to as "Qi". Every living things on the planet Earth is affected by it.
For example, 70% of our body is water. Imagine, if the water you drink does not have good "Qi", you will get ill easily. Our body also needs air, the oxygen. If you don't breathe for 10 minutes, you will die. Therefore the study of Feng Shui is the study of how the "Qi" affects us.