About fills and strokes
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 a stroke. You can
also create dashed strokes using Path options, and paint stylized
strokes using brushes.
Note: When working with Live Paint groups,
you can apply a brush to an edge only if you add a stroke to the
group using the Appearance panel.
The current fill and stroke colors are displayed in the Tools panel.
Fill and Stroke controls