What is natural aspiration in an engine?

A naturally aspirated engine is an internal combustion engine that does not rely on a supercharging device. The four working stages of this engine include intake (the piston moves downward to create low pressure and draw in air), compression (the piston moves upward to compress the mixture), power (the combustion of the mixture pushes the piston), and exhaust (the discharge of exhaust gases). Compared to turbocharged engines, naturally aspirated engines have a simpler structure, lower maintenance costs, and more responsive low-speed performance, making them suitable for daily driving, though their peak power and torque output are lower. Their smooth power delivery and reliability maintain their significant role in small and medium-sized cars and SUVs in the local market. For example, some models of Perodua and Proton use such engines to balance performance and economy.