Appearance panel

From the Appearance panel you can:

Manage strokes and fills for the selected object
Apply additional strokes and fills to the selected object
Hide or show strokes and fills
Set the active stroke and fill which can then be edited via the Stroke and Color panels
Apply independent blending control of strokes or fills
Delete strokes and fills

The following settings are available in the panel:

Options—with a stroke or fill selected, tapping this icon will display the entry's color and blend mode. From here, you can edit the properties for the selected stroke or fill using the color and blend mode pop-up menus.
Add Stroke—creates a new active stroke above the current active stroke.
Add Fill—creates a new active fill above the current active fill.
Remove—deletes the currently selected stroke or fill.
Stroke—the stroke entry showing the stroke color, width and blend mode. The active stroke will be denoted by a white dot to the left of its entry. This is the stroke that will be affected by Stroke panel editing.
Fill—the fill entry showing the fill color and blend mode. The active fill will be denoted by a white dot to the left of its entry. This is the fill that will be affected by Color panel editing.
Toggle Visibility—Tap to hide the stroke or fill or to make it visible again.