Why Lambda? or Why Serverless?

First of all, If you don't know about AWS Lambda, just visit official site.

Simply, Lambda executes our pre-made script(nodeJS, python, etc...) and return result as callback to client. So, as you guys know, we can do server side rendering(nodeJS) with some Front-End Frameworks.

We have to set some AWS services to make serverless micro service with Lambda. and Serverless is the framework that makes us use Lambda environment easily.