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In the last module,

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which was about networking,

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We started building an application that used

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more than one container.

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In this course module,

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we are going to continue on that road

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and we're going to build a multi container application

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and therefore a more realistic kind of application.

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Because whilst you could absolutely also have applications

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that really only need one container,

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more on that in the deployment section later,

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you often will have more than one container.

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You often will have applications that consist

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of multiple different services working together.

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For example, a database, a backend web server,

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and a front end application, something like this.

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Now the idea behind this module is to show you

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how you can build a more realistic application

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consisting of multiple services

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and therefore multiple containers which work together.

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But the idea is also that you can practice

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what you learned over the last course modules.

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Because we are not really going to learn anything new

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in this section, rather,

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we're going to combine what we learned

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and apply what we learned to this multi-service,

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multi container application.

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Specifically in this module,

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we are going to have a look at

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how we can combine multiple building blocks,

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multiple services to one big app,

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and how we can use Docker for that

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to work with multiple containers.

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Now I will show you which kind of app we're going to build,

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or we're going to Dockerize in the next lecture,

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but thereafter, definitely also feel free to pause

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and to try this on your own first,

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before you continue together with me,

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because this will also be a great practice for you to apply

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what you learned over the last sections

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in a more realistic application.