The primary component in the Earth's atmosphere is nitrogen, which makes up about 78% of the total atmospheric composition. Following nitrogen, oxygen constitutes approximately 21%, while other gases, such as argon, carbon dioxide, and trace gases, account for the remaining 1%. Nitrogen plays a critical role in the atmosphere, as it is inert and does not support combustion. Oxygen, on the other hand, is vital for life, enabling respiration in living organisms. The balance of these gases is essential for maintaining life on Earth and contributes to various atmospheric processes, including weather and climate regulation.