When the piston reaches the bottom of its stroke also known as the bottom dead center the intake valve closes and the?

When the piston reaches the bottom dead center (BDC), the intake valve closes, sealing the combustion chamber. This marks the end of the intake stroke and prepares the engine for the compression stroke. As the piston moves back up to the top dead center (TDC), the air-fuel mixture that was drawn in is compressed, leading to a more efficient combustion process in the subsequent ignition phase. This sequence is crucial for the engine's overall performance and efficiency.