Object hinting allows you to improve object rendering by adjusting the display of an object so that it lines up with the pixel grid. For example, if you’re creating a button for the web, you can enable object hinting to ensure the object appears clean and sharp when exporting it as a bitmap.
The Pixel view of a square (left) with a 1-pixel line width that was created without object hinting. A copy of the square (right) displayed with object hinting applied.