What is a presigned URL in AWS - sharing a private file safely
A presigned URL is a normal-looking web link that lets someone download or upload one specific file in a private Amazon S3 bucket, for a lim...
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What is eventual consistency - the S3 promise, honestly
No — Amazon S3 has not been "eventually consistent" since December 1, 2020. Every PUT, GET, DELETE, and LIST against an S3 object ...
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What is object storage vs block vs file in AWS - S3/EBS/EFS in plain terms
Object, block, and file storage are three different ways of handing your data to a computer, and on AWS they map to three specific services:...
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What is snapshot in AWS - and how incremental saves you money
A snapshot is a point-in-time copy of your data — but on Amazon EBS, only the very first one is a full copy. Every snapshot after that is in...
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What is an AMI - the frozen server explained
An AMI (Amazon Machine Image) is not a server. It is a frozen, reusable template of one — the operating system, the installed software, and ...
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What is the AWS free tier really - three kinds, one page
The AWS Free Tier is not one thing. As of today it's two permanent things — Always Free services with a monthly allowance that never ex...
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What is an IAM policy - the JSON that grants everything
An IAM policy is a JSON document that tells AWS what a person or a system is allowed to do — and to what. That's it. No agent, no daemon...
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