A fill is a color, pattern, or gradient inside an object. You can apply fills to open and closed objects and to faces of Live Paint groups.
A stroke can be the visible outline of an object, a path, or the edge of a Live Paint group. You can control the width and color of a stroke. You can also create dashed strokes using Path options, and paint stylized strokes using brushes.
The current fill and stroke colors appear in the Tools panel, the Control panel, and the Properties panel.
To change these colors, select the object using Selection Tool, and then go to ‘Properties panel’ and select the appropriate color.