AZ
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Resources in a cloud environment are at different level of scope. While cloud providers operates from multiple geographic regions, many resources are accessible globally, but some are at much smaller scope (called AZ).
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The Simple Storage Service is a secure, durable, highly scalable and highly available Object Storage by AWS. Object Store means we can store Files but cannot install software. S3 provides easy to use, web service interface to store/retrieve any amount of data from anywhere.
Vipul Pathak 