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It's time for us to create our own server using Node.js.

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But before we get into that, let's understand to the question what is a server?

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Technically, a server is a computer program that runs on a computer.

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Well, this definition doesn't seem to be clear.

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So let's break it down into layman's understanding of a server.

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A server is a program that accepts requests from clients and then responds to those requests.

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The key word here is called the request and response.

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These two are the core responsibility of a server.

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A server, always take a request from a client and then process that request and give a response to

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the user based on the request.

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So as a back end developer, the server that we are going to create or you are going to create the core

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responsibility is to handle requests and response.

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Let's go back when we treated components of a Web application and let's talk more about a server.

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Well, a complete application comprises of clients.

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That is the front end part.

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So when we say clients, you always refers to the browser.

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For front end application, we use HTML, CSS and JavaScript to develop the front end application or

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we can use React.

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And that is what we have covered.

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That is HTML, CSS and JavaScript, and this is the front part of the application.

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Now to make a web application complete, definitely we need what is called a server.

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And the server that we are going to create, we are going to use Node.js to create our own server.

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So when a user makes a request, definitely the user is trying to fetch a data.

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In that case, we also need a data source.

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And we are going to use what is called MongoDB.

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Now let's look at the flow.

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Let's say that this client over here want to make a request to YouTube to fetch or to view trending

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videos.

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So the user will enter the URL of our server.

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In this case, going to be a looker.

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Host In production we're going to get our custom u URL.

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So let's say that we have developed this server called YouTube server.

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So when a user enter the URL and search for particular video, it means that this particular user is

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talking to our server.

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Then the server will also make a request to the database.

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So at this point, this what we call requests, meaning requesting what you want.

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Then after some time the server will be processing the data.

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At this point you're going to see loading.

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So after the request has completed and the response is ready, then the MongoDB or database source will

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send back the actual response to the server and the server will also send the results to the user.

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And this is what we call response.

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So as a backend developer, before they request get to the server, we are going to implement the code

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to handle that request.

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And then after the request has been received at this point to we are going to code to make business

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logic to fetch a particular video.

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So now we are done with the front end.

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So we are going to focus on the back end.

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That is our server.

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And the server comprises of the actual server and data source in this case MongoDB database.

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So this is what we are going to talk about to make a complete server.

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But let's move step by step and let's focus on a server.

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So in the upcoming videos, we are going to use no charges to create our own server whereby a client

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can visit our URL and then we will send a user what the person is requesting for.

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Let's get into that in the next video.