Die Casting is very similar to injection molding with the primary difference being that die casting produces alloy parts whereas injection molding produce plastic parts.  The dies, more commonly referred to as die cast molds, are created using very robust tool steel machined into shape.  Once the dies (molds) have been created, the alloy is then injected into the cavity chamber under pressure.  Depending on the desired part material, the mold chamber / cavity will either be hot or cold.   Parts manufactured from this process achieve the highest quality surface finish when compared to other metal casting processes.  Die casting is also the most optimal casting process for mid to high volumes.  Like injection molding, a variety of industry-known geometric design features to the end part and / or the dies should and often need to be taken into account.  These include draft, fillets, parting lines, bosses, holes, ribs, ejector pin locations and runners.