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# Glossary
## Bundle
A [directory structure](bundle.md) that is written ahead of time, distributed, and used to seed the runtime for creating a [container](#container) and launching a process within it.
## Configuration
The [`config.json`](config.md) file in a [bundle](#bundle) which defines the intended [container](#container) and container process.
## Container
An environment for executing processes with configurable isolation and resource limitations.
For example, namespaces, resource limits, and mounts are all part of the container environment.
## Container namespace
On Linux, a leaf in the [namespace][namespaces.7] hierarchy in which the [configured process](config.md#process-configuration) executes.
## JSON
All configuration [JSON][] MUST be encoded in [UTF-8][].
## Runtime
An implementation of this specification.
It reads the [configuration files](#configuration) from a [bundle](#bundle), uses that information to create a [container](#container), launches a process inside the container, and performs other [lifecycle actions](runtime.md).
## Runtime namespace
On Linux, a leaf in the [namespace][namespaces.7] hierarchy from which the [runtime](#runtime) process is executed.
New container namespaces will be created as children of the runtime namespaces.
[JSON]: http://json.org/
[UTF-8]: http://www.unicode.org/versions/Unicode8.0.0/ch03.pdf
[namespaces.7]: http://man7.org/linux/man-pages/man7/namespaces.7.html
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