AWS Lambda is a serverless computing service provided by Amazon Web Services (AWS) that allows you to run code without provisioning or managing servers. This enables developers to focus on writing code rather than dealing with the infrastructure. Lambda automatically scales your applications by running code responding to triggers such as data changes, system state shifts, or user actions.
https://businesscompassllc.com/a-step-by-step-guide-to-creating-a-simple-get-api-with-aws-lambda/