Shin Megami Tensei: Digital Devil Saga/Items

There are four classifications of items in Digital Devil Saga. First are Usable Items, which you can use on enemies when in battle, or on allies either in battle or in the field. Next are Cells, which are items you can sell to the Vendor to increase its inventory and receive various amounts of Macca depending on the current Solar Noise level. Following them are Bullets which can improve the strength of your characters' gun attacks and skills. Lastly are SP Items, these items are special items which are used to further the plot or access many of the game's secrets.

Usable Items
Usable items can be items used to attack enemies or defend and heal allies. Some items may be usable in battle or anywhere they may help.

Cells
Cells are sold to vendors to expand their inventory.

Bullets
Bullets improve the strength of gun attacks and skills. Some bullets also add special effects to these attacks.

SP Items
Special items have various effects usually tied to story-related events.