Tell what blob storage is, what specific types exist, and what they store.

Blob (Binary Large Object) storage is a type of data storage designed for storing large volumes of unstructured data, such as images, videos, audio, documents, and other binary files.

In the context of cloud services (e.g., Azure Blob Storage), several types of blob objects are distinguished:

• Block blobs — optimized for storing large amounts of data divided into blocks. Used for storing files that can be uploaded and downloaded in parts.
• Append blobs — similar to block blobs but intended for appending data to the end of the file, such as logs.
• Page blobs — consist of fixed-size pages, support random access, and are often used for storing virtual disks.

Each type of blob storage is optimized for different usage scenarios, but overall, blob storage serves for efficient storage and access to large binary data.