What is the significance of the atmosphere on earth?

So, it is customary to understand the atmosphere as the gaseous shell of a celestial body. She is held near him by means of gravity. Also, the atmosphere of our planet contains oxygen, which is used by various living organisms for breathing. That is, the atmosphere is vital for all living things on our planet.
It is also worth saying that absolutely all massive celestial bodies in our solar system have an atmosphere (for example, gas giants and most planets). The exception is Mercury.