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- This lesson is about conditionals.

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To start it, let me get you an overview

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of the different conditionals available.

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So there are handlers.

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A handler is a test that only runs,

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if it is triggered by a task
that has changed something.

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It's very convenient

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because that allows
you to not do anything,

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if no changes were required.

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Handlers make your
playbook more efficient.

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There are items.

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Items can be used to iterate over a list.

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So you can process easily,
all the different items

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that are in an array.

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There is when.

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When is used for
conditional task execution.

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So it allows you to
only run a specific task

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if something else is true.

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There are blocks.

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Blocks can be used to implement

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if-then-else-like statements.

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Then we have a register.

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We've already seen register,

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but register is very
important in conditionals

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because it's a useful help

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to record the result of
a task in a variable.

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And there is fail.

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Fail is a model that is used to perform

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a specific task on failure.

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And it helps you in doing
better failure handler.

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In the next couple of videos,
you'll learn all about them.