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Answer: Azure Blob Storage is Microsoft's object storage solution for the cloud. Blob Storage is optimized for storing massive amounts of unstructured data, which is data that doesn't adhere to a particular data model or definition, such as text or binary data. (S1)

Access

• Users or client applications can access objects in Blob Storage via HTTP or HTTPS from anywhere in the world. (S1)
• You can access objects through the Azure Storage REST API, Azure PowerShell, Azure CLI, or an Azure Storage client library. (S1)
• A storage account provides a unique namespace in Azure for your data. (S1)
• Every object that you store in Azure Storage has an address that includes your unique account name. (S1)

Access tiers

• Azure storage offers different access tiers so that you can store your blob data in the most cost-effective manner based on how it's being used. (S2)
• Hot tier: an online tier optimized for storing data that is accessed or modified frequently. (S2)
• Cool tier: an online tier optimized for storing data that is infrequently accessed or modified; data should be stored for a minimum of 30 days. (S2)
• Cold tier: an online tier for data that is rarely accessed or modified, but still requires fast retrieval; data should be stored for a minimum of 90 days. (S2)
• Archive tier: an offline tier for data that is rarely accessed and has flexible latency requirements, on the order of hours; data should be stored for a minimum of 180 days. (S2)

Claims

• id: C1 claim: Blob Storage is Microsoft's cloud object storage. source: S1 evidence: "Azure Blob Storage is Microsoft's object storage solution for the cloud."
• id: C2 claim: A storage account provides a unique namespace. source: S1 evidence: "A storage account provides a unique namespace in Azure for your data."
• id: C3 claim: Cool-tier data should be stored at least 30 days. source: S2 evidence: "Data in the cool tier should be stored for a minimum of 30 days."
• id: C4 claim: Archive-tier data should be stored at least 180 days. source: S2 evidence: "Data in the archive tier should be stored for a minimum of 180 days."

Sources

• [S1] Introduction to Blob (object) Storage - Azure Storage. Microsoft Learn (Azure docs). https://learn.microsoft.com/en-us/azure/storage/blobs/storage-blobs-introduction . License: CC BY 4.0 (MicrosoftDocs/azure-docs). Accessed 2026-11-04.
• [S2] Access tiers for blob data - Azure Storage. Microsoft Learn (Azure docs). https://learn.microsoft.com/en-us/azure/storage/blobs/access-tiers-overview . License: CC BY 4.0 (MicrosoftDocs/azure-docs). Accessed 2026-11-04.

License: this note is CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Summary by iinventedlight (AI-assisted).

@misc{iil_note_bg2jkfjd,
  author = {{iinventedlight}},
  title = {{Azure Blob Storage and its access tiers}},
  howpublished = {iinventedlight Library},
  year = {2026},
  date = {2026-11-04},
  url = {https://iinventedlight.com/library/notes/azure-blob-storage/},
  note = {Permanent ID iil:note:bg2jkfjd. License: CC-BY-4.0.},
}

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