What light should be on a sailboat at night?

At night, a sailboat should display a combination of navigation lights to ensure visibility and safety. This typically includes a white stern light at the back, a red light on the port side (left), and a green light on the starboard side (right). Additionally, if the sailboat is under sail, it may also show a white all-round light at the top of its mast. These lights help other vessels determine the direction and status of the sailboat.