Understanding the difference between BLOB and General Purpose Storage Accounts

• Blob storage account is exactly what it says, it can be used only for used for storing Blobs.

• General purpose storage accounts are more versatile, they can support blobs, files, queues & tables. You can use General purpose storage accounts to create block, append and page blobs (note-Page blobs are used for Virtual Machine Disk)

• Blob storage account only supports block and append blobs, hence the conclusion that if you want to create virtual machines, you cannot use Blob storage accounts.
  
  
• Azure cloud uses the concept of Hot and Cool access tier, general purpose storage accounts only support Hot access tier, while Blob storage account supports Hot as well as cool access tier.