Chromatic Orb is a type of currency in Path of Exile that is used to re-roll the random modifiers on a piece of rare equipment. It can also be used to craft sockets on items in a particular order. Chromatic Orbs are obtained by killing monsters, selling items to vendors, and trading with other players.

To obtain Chromatic Orbs, you can farm monsters, which drop a variety of items, including Chromatic Orbs. You can also purchase them from other players, which is usually the easiest method.

When it comes to spending Chromatic Orbs, there are two main uses. The first is to re-roll the random modifiers on a piece of rare equipment. This can be done by using the currency on the item you want to target. The second use is to craft sockets on items in a particular order. This is done by using the Chromatic Orb on the item you want to craft.