Ravi Sir's Cards › AWS
SQS vs SNS for Lambda — when each?
What is a VPC: your own private network inside one AWS Region, example ThreeTierVpc 10.0.0.0/16.
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What this card says
What it is
SQS buffers and retries per consumer. SNS fans out one message to many.
Why it matters
Use SQS when work must be processed with backlog. Use SNS for notify-many.
How / example
Checkout → SQS → worker Lambda. Order placed → SNS → email + stock Lambdas.