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# Terminology
A *local store* exists on the local filesystem of the machine where
Nix is invoked. The `/nix/store` directory is one example of a
local store. You can use other local stores by passing the
`--store` flag to `nix`.
A *remote store* is a store which exists anywhere other than the
local filesystem. One example is the `/nix/store` directory on
another machine, accessed via `ssh` or served by the `nix-serve`
Perl script.
A *binary cache* is a remote store which is not the local store of
any machine. Examples of binary caches include S3 buckets and the
[NixOS binary cache](https://cache.nixos.org). Binary caches use a
disk layout that is different from local stores; in particular, they
keep metadata and signatures in `.narinfo` files rather than in
`/nix/var/nix/db`.
A *substituter* is a store other than `/nix/store` from which Nix will
copy the realisation of a derivation instead of building it. Nix will
not copy a realisation from a remote store unless one of the following
is true:
- the realisation is signed by one of the `trusted-public-key`s
- the substituter is in the `trusted-substituters` list
- the `no-require-sigs` option has been set to disable signature checking
- the derivation is a fixed-output derivation
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