AWS Lambda

AWS Lambda is a serverless compute service that allows us to run code without provisioning or managing servers. It falls under the Function-as-a-Service (FaaS) service model, where the user provides the code, and the cloud manages the underlying infrastructure.

In a serverless architecture, the Lambda function adds business logic and acts as a glue between multiple managed services.

How Lambda functions work

The Lambda function is invoked by a trigger, which can be any AWS service or configuration, for example, adding a file to an S3 bucket. The entry point of a Lambda function is a function handler, which contains the code for the task to be executed. After invoking the function, it launches a container runtime, copies the code, executes it, and returns the result.

Once the handler processes the initial event, the runtime sends additional events in succession. This cycle continues, allowing each instance of your function to handle ...