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Let's get started with back end development.

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Before we explain what is back in development and who is a back end developer, let's have a look at

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the components of web application.

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In that way, you better understand where back end development fits into play.

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Perfect.

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So for every web application talking about Facebook, YouTube, Instagram, they are all made up of

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what component?

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And that is three components that makes up that particular web application.

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So let's have a look.

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The first component is what we call the client.

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And in programming we refer to the client as the browser.

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And for the front end part, we use HTML, CSS and JavaScript or we can use react for front end part

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of the application.

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So the first component is what we call the client.

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The second component is what we call the server, where the actual business logic lies.

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And to implement a server, you also need programming languages to get it done.

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So for our case, we are going to use JavaScript, which is Node.js, and within the server we also

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need what is called database, where all the data about application are going to reside.

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And for our case we are going to use MongoDB for this purpose.

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So let's see what goes on here when this particular client or user is trying to use our application.

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So first step is the user will enter the URL of application.

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In that way, the user is talking to our server that we have built using Node.js and also the server

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will talk to MongoDB.

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So this process is what we call the request, meaning requesting what we want.

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So where it is loading our server is making a request to the database to fetch a particular data that

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this user is requesting for.

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In that way, the data inside our database, we will return back and give it to our server and then

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our server will give it to the user.

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And this what we call the response.

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So for this entire application, that is for back end development, we are going to focus on this two

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component.

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That is how we can create a server and then how we can allow our server to interact with our database.

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So these are the components of web application.

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So in the next video, we will have a look at what is back in development, the programming languages

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we need to learn and what are the roles of backend developer.