What structure holds the sails in place on the sailboat?

The mast is the tall vertical structure on a sailboat that supports the sails and holds them in place. It serves as the main support for the rigging, which includes various lines and cables used to control the sails. The mast allows the sails to be raised and adjusted, enabling the boat to harness the wind effectively for propulsion.

In contrast, the keel is a stabilizing feature that extends below the waterline, providing balance and helping to prevent the boat from capsizing. The rudder, located at the back of the boat, is used for steering, allowing the operator to change the direction of the vessel. The deck refers to the flat surface on which people stand or work but does not have a role in supporting the sails directly.