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So now let's talk about the AWS SDK overview.

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So what is SDK?

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Well, what if you wanted to perform actions on AWS

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directly from your applications code

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without using the CLI that we've been using so far?

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For this, we use an SDK which is a software development kit

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and there are a bunch of official SDKs for AWS

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in different languages,

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for example Java, .NET, Node.js,

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PHP, Python, Go, Ruby, and C++, okay?

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And maybe the list will get longer over time.

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So we've been using the Python SDK when we are using the CLI

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because the CLI is actually written in Python

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and it uses the Boto3 SDK.

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Okay, so we use the SDK when we issue API calls

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against AWS services, for example DynamoDB or Amazon S3.

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And as I said, fun fact, the CLI uses the Python SDK Boto3.

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So the exam expects you to know when you should use an SDK.

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So we'll see the SDK

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when we get to the Lambda functions in this course

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and we'll see how the SDK works in practice with code.

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So in the meantime, we're good to go.

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So good to know, if you don't specify a region

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and you don't configure a default region,

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then the us-east-1 will be chosen by default

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by your SDK to issue API calls

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and that is something the exam can test you on as well

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on the developer exam, okay?

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So that's it for the SDK at a high level.

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Don't worry, we'll get some practice with it,

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but it's good to get an introduction

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and I will see you in the next lecture.