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Okay, so let's discuss now

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what is serverless.

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So serverless is something new.

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And the developers when you use serverless services,

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you don't have to manage servers anymore.

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So it's not that you don't have servers anymore,

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it's just that you don't manage them.

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You just deploy code

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and originally, you just deploy it functions.

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So initially serverless meant Function as a Service,

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or FaaS.

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But now serverless means a lot more.

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So in the beginning,

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serverless was pioneered by AWS Lambda

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that we'll see in the section,

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but now also includes anything that is remotely managed.

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So databases, messaging, storage,

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as long as you don't provision servers.

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So serverless doesn't mean there are no servers,

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it just means you don't see them

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or you don't provision them.

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So if we drill down into what serverless means,

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in AWS, we have our users

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and they would get for example,

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static content for from our S3 buckets

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delivered as a website's

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or CloudFront plus S3.

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Then we would login with cognito,

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this is where our users would have their identity stored.

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And they would invoke your REST API

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through the API gateway,

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the API gateway would invoke Lambda functions,

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and Lambda functions would store

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and retrieve data from DynamoDB.

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So this is just an example.

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This section is going to be dedicated to

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learning a lot of things around Lambda DynamoDB,

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API Gateway, Cognito, and so on.

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But so it's just to give you an a reference architecture

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for serverless applications.

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So in AWS, it's Lambda DynamoDB, Cognito, API Gateway,

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Amazon S3,

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but also things we've already seen such as

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SNS and SQS,

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yes indeed,

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we did not manage any servers for SQS and SNS

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and it was scaling on its own.

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So that fits the serverless use case

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Kinesis Data Firehose, because again

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it scales

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based on the throughput you have

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you just pay for what you use

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and you don't provision servers,

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Aurora Serverless,

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when your Aurora database

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scales on demand

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without you managing servers,

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step functions and fargate

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because fargate was a serverless function of ECS,

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where we didn't provision the infrastructure

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to run our Docker containers.

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So hopefully this is short

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and sweet introduction to serverless.

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Next lecture, we'll be starting with AWS lambda.

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And it will be a lot of content to learn,

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but the exam does test you heavily

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on your serverless knowledge.

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So let's get started.

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(keys tapping)