Natural Satellites:
Natural satellites are celestial bodies that orbit around a planet or a dwarf planet. They are also known as moons. The Earth has one natural satellite, which is called the Moon. Other planets in our solar system also have natural satellites. For example, Jupiter has 79 known natural satellites, Saturn has 82, and Mars has 2.

Human-made Satellites:
Human-made satellites, on the other hand, are artificial objects that are launched into space by humans. They are designed to orbit around the Earth or other celestial bodies for various purposes such as communication, weather forecasting, navigation, scientific research, and military surveillance. Human-made satellites are made by humans using advanced technology and engineering.

Differences:
1. Origin: Natural satellites, like the Moon, are formed naturally as a result of the gravitational pull of a planet or a dwarf planet. They are part of the celestial bodies in the solar system. Human-made satellites, on the other hand, are created by humans and launched into space using rockets.

2. Size and Composition: Natural satellites are usually larger in size compared to human-made satellites. For example, the Moon has a diameter of about 3,474 kilometers, while human-made satellites are relatively smaller in size. Natural satellites are composed of rock and other materials found in space, whereas human-made satellites are made of various materials such as metal, plastic, and electronic components.

3. Purpose: Natural satellites do not serve any specific human purpose but play important roles in the solar system. They can affect tides, stabilize orbits, and even assist in scientific research. Human-made satellites, on the other hand, are designed for specific purposes such as communication, weather monitoring, navigation, and scientific exploration.

4. Lifespan: Natural satellites have a long lifespan and can exist for billions of years. They are not subject to decay or obsolescence. Human-made satellites, however, have a limited lifespan and eventually become non-functional or run out of fuel. They may either be left in orbit or deliberately de-orbited to burn up in the Earth's atmosphere.

5. Control: Natural satellites are controlled by the gravitational forces of the planet they orbit. Human-made satellites, on the other hand, are controlled and operated by humans on Earth. They can be maneuvered, repositioned, and even deactivated when necessary.

Overall, the main difference between natural and human-made satellites lies in their origin, size, purpose, lifespan, and control. While natural satellites are a natural part of the solar system, human-made satellites are a product of human technology and serve various practical purposes in space exploration and communication.