A crosshair cursor is a symbol on your computer screen that helps you see where your mouse or pointer is located. It looks like two lines crossing each other to form a "+" shape. The crosshair cursor is used in programs like AutoCAD to help you select objects or points accurately. It shows you the exact position of your cursor, making it easier to draw lines, create shapes, and select things with precision. You can customize how the crosshair cursor looks and behaves in AutoCAD to suit your preferences.