Serverless development is an approach to software development that allows developers to create and run applications and services without worrying about managing servers. With Serverless, the cloud provider manages the servers for you. This frees developers to focus on creating code instead of configuring or managing infrastructure.
AWS Lambda is a serverless platform from Amazon Web Services. Lambda allows you to run code without provisioning or managing servers. You can write Lambda functions in Java, Node.js, Python, or Go and upload them to AWS Lambda. When a function is triggered (for example, when an event occurs in AWS), AWS Lambda provisions a new function instance to handle the request.