Amazon Elastic Block Store (EBS) is a block-level storage service provided by Amazon Web Services (AWS) that allows users to create storage volumes and attach them to Amazon EC2 instances. These volumes behave like raw, unformatted block devices and are particularly well-suited for use as the primary storage for file systems, databases, or any applications that require fine granular updates and access to raw, unformatted, block-level storage. EBS supports advanced storage features such as snapshotting, cloning, and volume tagging, and it provides various volume types including General Purpose SSD, Provisioned IOPS SSD, Throughput Optimized HDD, and Cold HDD. EBS volumes are built on replicated back-end storage to prevent data loss in case of a single component failure. The service was introduced by Amazon in August 2008 and has since been widely used for various applications, including databases, big data analytics engines, and more. EBS is known for its scalability, high performance, and ease of use, making it a popular choice for storage needs in the AWS ecosystem.