Definition
Amazon Elastic Block Store, or EBS, is a block storage service offered by Amazon Web Services that provides persistent storage volumes for use with Amazon Elastic Compute Cloud (EC2) instances. These volumes are network attached and designed for high performance and durability, acting like virtual hard drives for your cloud servers. EBS volumes can be attached to a single EC2 instance at a time, ensuring data is readily available to the application running on that instance. This service is crucial for workloads requiring consistent and low-latency access to data, such as databases or boot volumes for operating systems. Unlike instance store volumes, EBS volumes persist independently of the life of the EC2 instance, meaning data remains even if the instance is stopped or terminated. Understanding EBS is vital for AWS certification exams like the Solutions Architect Associate and for cloud professionals managing AWS infrastructure, as it directly impacts data availability and application performance.