AWS Lambda is a serverless compute service that executes code in response to events such as website actions, https requests, files being modified or written to S3 buckets and a whole host of integrated AWS services that have the capability to trigger lambda functions in response to a state change.
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AWS Lambda is a service that allows you to run code and containers without the need to set up, manage or provision servers. Lambda runs your code on highly available compute cloud infrastructure via Functions. Lambda takes care of server and OS maintenance, scaling, code monitoring and activity/error logging.