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# Glossary
- [build system]{#gloss-build-system}
Generic term for software that facilitates the building of software by automating the invocation of compilers, linkers, and other tools.
Nix can be used as a generic build system.
It has no knowledge of any particular programming language or toolchain.
These details are specified in [derivation expressions](#gloss-derivation-expression).
- [content address]{#gloss-content-address}
A
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Besides content addressing, the Nix store also uses [input addressing](#gloss-input-addressed-store-object).
- [content-addressed storage]{#gloss-content-addressed-store}
The industry term for storage and retrieval systems using [content addressing](#gloss-content-address). A Nix store also has [input addressing](#gloss-input-addressed-store-object), and metadata.
- [store derivation]{#gloss-store-derivation}
A single build task.
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[store]: #gloss-store
- [Nix instance]{#gloss-nix-instance}
<!-- ambiguous -->
1. An installation of Nix, which includes the presence of a [store], and the Nix package manager which operates on that store.
A local Nix installation and a [remote builder](@docroot@/advanced-topics/distributed-builds.md) are two examples of Nix instances.
2. A running Nix process, such as the `nix` command.
- [binary cache]{#gloss-binary-cache}
A *binary cache* is a Nix store which uses a different format: its
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directly or indirectly “reachable” from that store path; that is,
it’s the closure of the path under the *references* relation. For
a package, the closure of its derivation is equivalent to the
build-time dependencies, while the closure of its output path is
build-time dependencies, while the closure of its [output path] is
equivalent to its runtime dependencies. For correct deployment it
is necessary to deploy whole closures, since otherwise at runtime
files could be missing. The command `nix-store --query --requisites ` prints out