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‫Okay. So now we're done

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‫with all of the Lambda invocations, now let's go

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‫into more Lambda configurations and deployments.

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‫So Lambda has the concept

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‫of environment variables and what is it?

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‫It's a key value pair in the string form,

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‫and they help you adjust the function behavior

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‫without updating your code.

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‫The function, the environment variables will be available

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‫to your code and the Lambda Service will on top

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‫of things at its own system environment variables as well.

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‫This is quite common when you're programming

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‫to use environment variables.

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‫So they're supported for Lambda.

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‫The cool thing is that we can encrypt

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‫these environment variables

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‫for example, by KMS to store secret values.

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‫And the secrets can be either encrypted

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‫by the Lambda service key or your own customer master key.

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‫So let's go ahead

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‫and do some practice with environment variables.