In general, files such as images, text files, media files, databases, backups, or virtual hard drives are typical examples of blobs that can be uploaded to the Storage Blob service. Blob storage offers two types of blobs: block blobs and page blobs. While creating a new blob, you have to specify its type, since each type has its own set of operations and features, we will talk about them separately in the following two sections.
A block blob is segmented into smaller chunks called blocks, each having a unique block ID. This allows you to upload blocks separately to the storage service, to then be committed into one single file, in what is called commit-based update semantics, which facilitates the transmission of larger files over the network. If any transmission failure occurs, it can be easily recovered by resuming the operation from the last successfully uploaded block.
Each block blob cannot consist of more than 50,000 blocks and cannot exceed a 200 GB maximum...