All 7 AWS Serverless Application Model (SAM) questions
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What is the SAM CLI, and how does it support local testing of serverless applications before deployment? How does the sam build and sam deploy workflow package and deploy a serverless application to AWS? How does SAM support defining event sources, such as API Gateway or S3 triggers, directly within a function's configuration? How does SAM support safe, gradual Lambda deployments using traffic shifting and automatic rollback? How can SAM templates be organized and parameterized to support deploying the same serverless application consistently across multiple environments like development, staging, and production?
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How does SAM support nested applications and reusable components through the AWS Serverless Application Repository?

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Answer

SAM applications can be published to the AWS Serverless Application Repository, allowing other teams or even the broader public to easily discover and deploy pre built serverless applications or components as nested applications within their own SAM templates, promoting reuse of common serverless patterns, such as a standard image resizing function, without needing to rebuild the same commonly needed functionality from scratch every time.
Resources:
  ImageResizer:
    Type: AWS::Serverless::Application
    Properties:
      Location:
        ApplicationId: arn:aws:serverlessrepo:us-east-1:123456789012:applications/image-resizer
        SemanticVersion: 1.0.0
Real-world example A company building a new application reuses a well tested image resizing function published to the Serverless Application Repository by referencing it as a nested application within their own SAM template, avoiding the need to write and maintain that functionality themselves.

Common follow-ups: How do you publish your own SAM application to the Serverless Application Repository?;What are the security considerations when using a third party published application from the repository?

Lambda & Serverless;IaC (CloudFormation)
All 7 AWS Serverless Application Model (SAM) questions