What is Serverless :
Pay for what you use
Service automatically scales up or down accordingly.
AWS Lambda allows upload the code to Amazon aws without the need of the server.
AWS Lambda is a Function as a service (FaaS) which is a serverless architecture that developers can use to write custom backend functions and deploy the function code directly to the cloud infrastructure
It falls under the Compute services in AWS.
Process :
1. Create a lambda function
2. Uplaod to AWS
3. Test and trigger
Lambda execution models:
1. Synchronous
2. Aysnchronous
3. Pull stream based
