What is an Upgrade Item in Genshin Impact?
Upgrade items are a particular kind of item level upgrade that can make certain Pokemon evolve. They can be obtained by spinning Pokestop discs, and sometimes as rewards for events related to evolution.
They can be added to weapons, armors, trinkets and gathering tools to increase stats or effects. Some upgrades also have the appearance of a certain cosmetic when used.
Upgrade components
Upgrade components are items that can be slotted into weapons, armor and trinkets to give an additional bonus or effect while the equipment is used. They can be purchased through vendors, looted or received as rewards. They can also be crafted, dropped, or obtained by crafting. Upgrade components are required to be higher leveled than the Best item upgrader they are added to. Most also require that the item upgrading be equipped with an upgrade slot.