The Windows Azure Blob Service uses a simple organizational structure for containers and blobs. A storage account has zero or more containers each of which contains zero or more blobs. Containers contain only blobs and may not contain other containers. There is no hierarchy for containers.
The Windows Azure Storage Service REST API provides support for a simulation of a hierarchical directory structure through an ability to parse blob names containing a special delimiter character and navigate the list of blobs while taking account of that delimiter. This delimiter is the forward-slash symbol (/). The Windows Azure Storage Client library exposes this feature through the CloudBlobDirectory class.
The CloudBlobDirectory class provides methods allowing blobs to be enumerated in a way that takes account of the directory structure built into the naming convention used. A blob name can include multiple levels of directory.