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Hello and welcome.

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In this section I want to start to tackle two very important questions that we're going to be answering

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throughout this entire course.

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The two important questions are What is talker and secondly why do we use stalker.

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We're going to first tackle why we use stalker by going through a quick little demo right now.

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Now I'm going to show you a little flow diagram.

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This is a flow of probably a process you've gone through at least once in your life before it's a flow

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of installing software on your personal computer.

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And I bet at least once for you this is what has happened.

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Maybe you have downloaded some installer you run that installer and then inevitably at some point in

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time you end up getting an error message during installation.

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So what do you do.

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Well you probably troubleshoot the issue by you're on Google.

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You try to find a solution eventually solve that issue.

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You then run the installer only to find Hey today you have some other air appearing and then you have

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to go through this entire troubleshooting process again.

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So this is at its core what Docker is trying to fix Docker wants to make it really easy and really straightforward

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for you to install and run software on any given computer not just your computer not just your personal

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laptop your personal desktop but on web servers as well or any cloud based computing platform.

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I want to give you a very quick demonstration of this flow right here in action and then show you how

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quickly I can solve installing a problem versus me installing a piece of software by making use of Docker.

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So going to very quickly go through the flow of installing a piece of software called REDDEST RED IS

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is an in-memory data store.

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We're going to be using it quite a bit throughout this course.

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But right now I just want to give you a quick demo of how it can be a little bit challenging to get

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installed on your own computer.

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So I'm just gonna go to the installation steps here very quickly.

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So this is the red is home page.

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This is the official download page.

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In theory I could use the documentation here to install red is on my local machine.

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I'm gonna go down to the installation section and it very proudly says Oh yeah.

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Just run these four commands right here and boom that's pretty much it.

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You can then then run read us.

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So I'm gonna grab the first command right here.

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I'm going to copy it and then I'm going to run it inside my terminal so I'll paste.

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There is the same exact command I'm going to run it and sure enough yet I get an error message.

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Now in this case the error message is a little bit predictable.

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It's complaining about a program that is just not installed on my local machine.

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Now I could definitely go and troubleshoot this install that program and then try installing readies

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again.

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But that's the whole point.

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You kind of get into this endless cycle of trying to do all this troubleshooting as you are installing

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and running software.

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So let me now show you how easy it is to run read as if you are making use of Docker instead.

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I'm going to go back to my camp command line and I'm going to run one single command.

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I'll say Docker run Dash I t read it's like so enter and then after a very brief pause almost instantaneously

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I have an instance of red is up and running on my computer.

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And that's pretty much it.

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That is Docker in a nutshell.

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That is how easy it is to run software when you're making use of Docker.

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So to answer the question very directly of why we use Docker Well we make use of it because it makes

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life really easy for installing and running software without having to go through a whole bunch of setup

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or installation of dependencies.

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Now we're going to learn many more reasons throughout this course of why we use Docker.

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But I want to give you a very quick demo and show you how easy it can be to get up and running with

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some new piece of software when you are using Docker.

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Let's take a quick pause right here.

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We're going to come back the next section and start trying to the answer of insulator the question of

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what Docker is.

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So I'll see you in just a minute.