A wand is a rod that contains an enchantment for casting magic spell(s). Unlike scrolls, wands often have multiple charges (possibly even unlimited). Their use are generally limited to creatures of the qualified class, or those with sufficient UMD skill.
The Craft Wand feat allows a spellcaster to enchant a bone wand with any spell (up to 4th level) they know. This cannot be used with spell-like abilities or invocations.