Which Azure service is designed for cloud storage of unstructured data?

Azure Blob Storage is the service specifically designed for the cloud storage of unstructured data, which includes text files, images, videos, and other types of binary data. It provides a highly scalable and secure option to store vast amounts of data, allowing for easy accessibility over HTTP/HTTPS.

This service is particularly useful for scenarios where you need to store large quantities of unstructured data in the cloud and retrieve it as needed. With features like tiered storage options (hot, cool, and archive), Azure Blob Storage allows for cost-effective management of data based on access patterns.

In contrast, other services mentioned serve different purposes: Azure SQL Database is meant for structured relational data, relying on SQL for data querying and manipulation. Azure Data Factory focuses on data integration services for orchestrating data workflows, rather than storage. Azure Cosmos DB, while capable of storing unstructured data, is primarily a NoSQL database designed for high availability and low-latency access across globally distributed applications.

Therefore, Azure Blob Storage stands out for its specific optimization towards unstructured data, making it the correct choice for the question posed.