Web Development – What is Client Server Model
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Web Development – What is Client Server Model

Welcome back to web technology core concepts
at Learning Journal. In the earlier session, I said, a website
is a collection of one or more web pages. So, a website could be as simple as a single
HTML page. Right? If you have a web page, you can create a website
and run it on your local machine. However, no one else on the planet will be
able to access your website until you take it to the Internet. Right?
So let’s talk about taking your website to the Internet.
I have this simple web page. This page is my website.
It is not that great, but this is what I have. How can I take this website to Internet?
What do I need? Just think about it. Tell me at least one logical thing.
Yes, you are right. The first thing that I need is a computer
with an Internet connection. We all have such computers.
But unfortunately, that is not enough to make my website available over the Internet.
I need at least one more thing. That is a web server.
I am sure you are wondering with some questions. What is a web server? and why do we need them?
Let us try to understand the need for a web server and then we will try to define a web
server. Suppose I have a single page website on my
laptop. I saved it at the following location. Now I want to make it available to the Internet.
So I connected my laptop to the Internet. As soon as I connect my laptop to the Internet,
my Internet service provider will assign a unique IP address to my computer.
On the other side, you are sitting somewhere on this planet with another computer.
You also connected your machine to the Internet. Technically, there is a connection between
our computers and both of them have two different unique
IP addresses. Right? You should be able to start a browser on your
laptop and type my website’s address. And there comes a series of problems. The
first problem is this. What is the address of my website?
Well, it could be the IP address of my laptop and the file name.
Let’s assume that the first problem is solved. Now you can type this address into the web
browser. The browser will look at the IP address.
The IP address is like a telephone number. If the browser knows the IP address,
It can send some data to the computer with that address. Right?
So the browser sends a request to my computer asking for the myfirstpage.html page.
That request reaches to my computer. And here comes the next problem.
No one is there to listen to that request. It is same as a guest is knocking at my door,
but there is no one in the house to listen and respond.
So We need to have a software that keeps listening and responding to such requests.
That’s what the web server is. So at the fundamental level, we can think
of a web server as a piece of software that listens and responds to the end users
over the Internet. It may not be the most appropriate definition
for a web server, but this is what a web server means at a high
level. So the website works using a client-server
model. In this model, as the name suggests, there
are two actors. Client and Server
The client sends a request, and the server returns an appropriate response.
In case of our example, the browser is the client.
It sends a request for the myfirstpage.html page.
The web server is the server. It listens for the request and returns the
myfirstpage.html page to the browser. Great! The example gives you a high-level
idea of how a website works, and we also talked about the client-server
architecture. We will talk a little more about a web server
in an upcoming video. See you again in the next video.
Thank you for watching Learning Journal. Keep learning and keep growing.

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