# Concepts and definitions
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 This section describes key concepts and defines terminology specific to this Guidance:  

 **archive** 

 Any data stored in an Amazon Glacier vault, such as a photo, video, or document. An archive is similar to an Amazon S3 object: it's the base unit of storage in the Amazon Glacier service. For more information, see [Archive](https://docs.aws.amazon.com/amazonglacier/latest/dev/amazon-glacier-data-model.html#data-model-archive) in the *Amazon Glacier Developer Guide*. 

 **chunk** 

 Term used to describe a *part* in a multipart upload or download for the Amazon Glacier service. This Guidance uses multipart upload to transfer the archives. For more information, see [Uploading Large Archives in Parts (Multipart Upload)](https://docs.aws.amazon.com/amazonglacier/latest/dev/uploading-archive-mpu.html) and [Retrieving Amazon Glacier Archives Using AWS Management Console](https://docs.aws.amazon.com/amazonglacier/latest/dev/downloading-an-archive-two-steps.html) in the *Amazon Glacier Developer Guide*. 

 **inventory** 

 A point in time snapshot or listing of the archives stored within an Amazon Glacier vault. For more information, see [Downloading a Vault Inventory in Amazon Glacier](https://docs.aws.amazon.com/amazonglacier/latest/dev/vault-inventory.html) in the *Amazon Glacier Developer Guide*. 

 **tag** 

 A key-value pair used to categorize storage in the Amazon S3 service. For more information, see [Categorizing your storage using tags](https://docs.aws.amazon.com/AmazonS3/latest/userguide/object-tagging.html) in the *Amazon S3 User Guide*. 

 **vault** 

 A container in the Amazon Glacier service for storing archives. An Amazon Glacier vault is similar to an S3 bucket. For more information, see [Vault](https://docs.aws.amazon.com/amazonglacier/latest/dev/amazon-glacier-data-model.html#data-model-vault) in the *Amazon Glacier Developer Guide*. 

 **workflow\_run** 

 An identifier used to represent the transfer of an Amazon Glacier vault to an S3 bucket. The Guidance randomly generates the `workflow_run` value on the first run (or you can choose the value). The Guidance uses this value when resuming a transfer. 

**Note**  
 For a general reference of AWS terms, see the [AWS Glossary](https://docs.aws.amazon.com/general/latest/gr/glos-chap.html).