website/content/en/docs/reference/glossary/app-container.md

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App Container app-container 2019-02-12 A container used to run part of a workload. Compare with init container.
workload

Application containers (or app containers) are the {{< glossary_tooltip text="containers" term_id="container" >}} in a {{< glossary_tooltip text="pod" term_id="pod" >}} that are started after any {{< glossary_tooltip text="init containers" term_id="init-container" >}} have completed.

An init container lets you separate initialization details that are important for the overall {{< glossary_tooltip text="workload" term_id="workload" >}}, and that don't need to keep running once the application container has started. If a pod doesn't have any init containers configured, all the containers in that pod are app containers.