WEBVTT

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All right guys. I need this lesson we're going to be using what we learned so far about setting up a new

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web site with a server using Node and Express to create a really simple web site that acts as a calculator,

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so I can simply enter maybe two numbers, 5 and 6, and I hit calculate, and I get the result back.

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Now, in the process of building this, we're going to get to create our very first web application,

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and it's not just a web site anymore.

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Up till now we've only been making essentially static web sites, right, where our browser will make a

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request to the server and the server sends back the CSS, the HTML, the Javascript files.

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And if there's any Javascript code that needs to be run, it gets run on the client side,

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basically our user’s browser. And that Javascript gets sent to the browser and run when the user loads

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up the web site.

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Now in this lesson we're going to be making our code run server side.

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So when our web site makes a request to our server, it's going to execute the code and only deliver the

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outcome back to the user, so the user doesn't get to see any of the code and logic of our calculator.

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It's all done on our server.

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And once we grasp this concept, then we'll be able to make much faster, more complex web sites that can

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do computation before it even renders the web site to be delivered to the user,

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and we'll be able to interact with databases, and query, and search, and manipulate our databases, and create

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much more interesting web applications.

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So this is the core concept that we're going to tackle in the coming lessons of this module.

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But first there's a challenge.

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So head over to the next lesson and get started.