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SAM is able to run AWS Lambda functions locally and to emulate some API Gateway behavior. It doesn't allow you to run all the other services like DynamoDB, SNS, S3, etc. locally. As Serverless applications often rely on such additional AWS services, the ability of SAM to run AWS Lambda functions locally doesn't really help for running such applications locally.

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You guys don't even take the time to do a simple search... https://docs.aws.amazon.com/amazondynamodb/latest/developerg...

You can have pretty much all the services locally if you want you can even have a step function locally

DynamoDB and AWS Step Functions are notable exceptions to the fact that AWS services are usually not available locally. The vast majority of AWS services isn't available outside of AWS.

I have a local tool for every AWS service just tell what are you looking for, for example I use https://github.com/softwaremill/elasticmq to emulate SQS locally

There's also https://github.com/localstack/localstack for the heavier services.

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