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Registration is the process of making an object (such as an item or block) known to the game during runtime with an attached <code>ResourceLocation</code> name. Unregistered objects are a likely cause of game loading crashes or bugs, so it is important to register objects correctly.

Most objects that are known within the game are handled by a Vanilla <code>Registry</code> or a Forge <code>IForgeRegistry</code>. Each registry uniquely defines each of its own objects through a "registry name" via a [[Using Resources#ResourceLocation|ResourceLocation]].
Registries themselves have a name and are registered to the Vanilla root registry or <code>RegistryManager</code>.
It is important to keep these distinct; although both are called registry names.

{{Tip|In a global context, each object is universally unique through its <code>ResourceKey</code>: a concatenation of its registry's id and the object's registry name.}}

Forge expands Vanilla's registries to add important features for modded environments, such as world saving of integer ids and network syncing of integer ids, to ensure consistency when different mods and entries are present.

Forge registries preserves the same loading order of Vanilla registries, with all modded registries fired after Vanilla in alphabetical order by string comparing namespace then path. This loading order determines what order registries have their entries registered. All registries wrapped by Forge can be found within the <code>ForgeRegistries</code> class.

{{Tip|All registries have their own set of names and objects, so the same name (e.g. <code>examplemod:object</code>) can be reused in multiple registries, like blocks and items.}}

{{Tip/Warning|If two registry objects within the '''same''' registry have the same name, the second object will override the first.}}