Azure Blob Storage is a scalable cloud-based object storage service designed for handling large volumes of unstructured data, such as images, videos, documents, and backups. It allows to store, manage, and access data from anywhere, with options for different tiers of storage based on frequency of access and cost needs. Blob Storage supports massive scalability, making it ideal for use cases like data lakes, media distribution, and archiving. It also integrates with other Azure services for analytics, machine learning, and disaster recovery.