Charges

Items with charges (also known as "charged items") are simply items that have limit on the number of uses until they disappear.

For example, (tooltip shown on the right) has 5 charges, so it can be used only 5 times, and after that it is gone. The usual number of charges is 1 for explosives, bombs, and enchants, and 3 to 5 for various oils, poisons, etc.

Items with charges usually cannot be equipped but are used directly, either to act upon a target, or to enhance an item (like the enchanting rewards from the Zandalar Tribe).

Some buffs like Lightning Shield also have charges, and the buff disappears when all charges are expended.