This is the principle or organization, where the the overall device is able to do things that the components would not be able to achieve by themselves.
A human is such, as is a watch or a motor car.
A human has many sub-components, brain, skeleton, liver, blood and so on, each of which contributes to the total ability.
A bulldozer has a main motor, an efficient propulsion system, various hydraulic and electrical systems and so on. All of which make the whole machine very effective.
This applies in social organizations such as a business or a church or a sports club as well.