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- Now let's talk about Amazon Cognito.

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Amazon Cognito is a fairly
rich service in itself

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in that it does a number
of really useful things,

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especially in regards
to mobile applications.

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One of the great things
that Amazon Cognito does

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is help us with identity.

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By integrating with major
authentication providers

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like Twitter, Facebook,
Google, so on and so forth,

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a number of others, it allows
us to implement single sign-on

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or login with Facebook, login with Twitter

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on any device or any platform.

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It could be laptop, desktop,
tables, mobile devices.

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Instead of writing all of the various code

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to account for all of the differences

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between these various providers,

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because they all do things
slightly differently.

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You know, Twitter versus
Facebook versus Google.

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We simply write against one
platform, that is Cognito.

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We write against that one service
and allow that one service

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to handle the details of
these various services for us.

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It also helps us manage unique identities

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across various platforms and devices,

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and helps implement temporary keys,

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as we've talked about before.

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In the cases where we
have mobile applications

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that need access to other Amazon services,

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we can leverage that single sign-on,

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you know, login with
Facebook, login with Twitter,

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and then leverage in Cognito
and the security token service,

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we can implement temporary
keys and deliver those

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temporary credentials back
to our mobile application

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and then allow our mobile
application to call

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other AWS services directly, such as

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Amazon Simple Storage Service,
Amazon Dynamo DB, and so on.

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Another really powerful feature

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of Amazon Cognito is Amazon Cognito Sync,

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and this is a tool that
allows us to sync data

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between various
applications and platforms.

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Let's say we have different app data

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and we have that application on a desktop,

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we have it on our tablet,

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we have it on our smartphone,

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and Cognito can help sync that data

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between these different devices.

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Perhaps we want to save
the state of our game

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or the state of the book we're reading.

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Perhaps we want to maintain
the same preferences

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from device to device.

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It works across various devices,

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it works across different
operating systems.

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It can also enable us to allow
our users to work offline

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by storing data locally
in a SQLite database,

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and so whether or not the
user is online or not,

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they can continue to work,
storing their data locally

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and then once they're back online,

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then Amazon SDK can automatically re-sync

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back to the Cognito servers.

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You can see Amazon Cognito
is really powerful service

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that enables a lot of the hard work

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and the drudgery of developing
for mobile applications.

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Single sign-on, syncing,
these are common things

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that most applications need to do,

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so why reinvent the wheel?

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Why bother with all of
the details of logging in

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with various services and syncing
between various platforms?

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Just leverage one service
that helps you do all of that,

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and that is Amazon Cognito.