So, what is this actually?
First, let's talk about what is an application.
An application is a computer program with an interface, enabling people to use the computer as a tool to accomplish a specific task. That means, a tool that fulfills our needs through the internet. That's it.
For eg, if you want to buy a mobile from an online store, then you must need a platform to purchase it. This may be from your mobile or computer. Right? That platform is called an Application. Suppose, if you want to buy an iPhone 13 online, then you need to first find a platform who offers online purchases. Let's say from amazon, here, amazon is the platform that you are using for making the purchase. So, amazon is the application.
Got an idea of what an application is?
Awesome!
Now, let's understand what's a Centralized Application.
Centralized application, is an application, where both data and functionality(business logic) reside on a server that is owned and controlled by a single entity. This entity can be an organization or an individual.
Getting confused?
Cool!
In simple words, It's an application which is managed by a company or an organization or like this, who can fully control this application and its functionalities.
You purchased an iPhone from Amazon, right? Let's take this to explore more.
When you are going to open an account on amazon, you are giving personal details to it, like name, email, mob etc. Your details are stored inside amazon's database. Here, amazon can view your data, can view your order history, also amazon can modify it(likely they are not). Amazon has full access to your data. So, here amazon acts as a Centralized Application.
Like this, let's take another application. For eg, when you are making a train ticket booking from the IRCTC application, you are giving IRCTC with your personal data(name, mob, journey details, etc). IRCTC has full access to your data. So, here IRCTC acts as a centralized application.
Here is the structure of the centralized application.
In this picture, you can say the server is amazon and the client is you, who made the purchase. Let's end this...
In centralized application data is owned and controlled by the server.
Functionality is owned and controlled by the server.
It makes use of the Hub and Spoke(star) network model(used in the picture).
Now, we reached the end of what a centralized application is. I'm pretty sure, you are now clearly understood about the centralized application.
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