Artifacts refers to the collection of data, such as application source code, built applications, dependencies, definitions files, templates, and so on, that is worked on by pipeline actions. Artifacts are produced by some actions and consumed by others. In a pipeline, artifacts can be the set of files worked on by an action (input artifacts) or the updated output of a completed action (output artifacts). Actions pass output to another action for further processing using the pipeline artifact bucket. CodePipeline copies artifacts to the artifact store, where the action picks them up. For more information about artifacts, see Input and output artifacts.
ビルドの成果物だけじゃなくてビルドに必要なソースコードとかパイプラインに必要なファイルとか諸々一式がArtifactsという概念らしい。
