What raises and lowers a presser foot on a sewing machine?

A presser foot on a sewing machine is raised and lowered using a lever or a button, typically located on the back or side of the machine. When the lever is lifted, the presser foot rises, allowing fabric to be positioned or removed. Conversely, pressing down on the lever lowers the presser foot onto the fabric, applying pressure to keep it in place while sewing. Some machines may also feature a knee lift for hands-free operation.