Which Azure storage solution is best for securely storing unstructured log files from multiple applications?

Azure Blob Storage is ideal for storing unstructured data like log files. It's highly scalable, cost-effective, and offers various access tiers (hot, cool, archive) suitable for data with different access patterns, making it perfect for long-term log retention and analysis. It also supports robust security features. Azure SQL Database is a relational database, unsuitable for unstructured log files. Azure File Storage is designed for shared file access via SMB/NFS, not optimal for large volumes of unstructured logs. Azure Data Factory is a data integration service, not a storage solution itself.