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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.