The two main types of pneumatic cylinders are:
1. **Double-Acting Cylinders**: These cylinders use air pressure to extend and retract the piston. They have two ports-one for air to extend the piston and one for air to retract it. They provide a pushing force in both directions, making them versatile for various applications.
2. **Single-Acting Cylinders**: These cylinders use air pressure to move the piston in one direction only. They have a single port where air is applied to extend the piston. A return spring or external force is used to retract the piston. Single-acting cylinders are typically used when force is needed in one direction and retraction is not as critical.
