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Before we begin to understand and work with containers in general,

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it is useful to take a quick look at how do we

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make web applications.

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Some of you might even ask what is a web application?

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Since the term is quite widely used, but it is quite superficially explored.

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Just take a look at some of these examples.

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Productivity tools like G Suite, social media giants like

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Facebook, video chatting applications like Skype, entertainment

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platforms like Netflix, payment services like PayPal or even

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e-learning platform like Udemy itself are all web applications

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in one way or another, which means you are using web application

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interface at this very moment.

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If we have to define it, a web or web-based application is

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any program that is accessed over a network connection using

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HTTP rather than existing within a device's memory.

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Of course, the definition is flexible and you may choose

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to use one protocol over another. But on a broader perspective,

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it is all about not using your device like PC, tablet or

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mobile for computing purpose.

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Instead, we let those mighty costly and reliable servers

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do the heavy lifting and we just access the result of our

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requested data from some web interface like HTTP.

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This has so many advantages which just can't be overlooked.

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First of all, the performance of the applications will not

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be determined or limited by the hardware they are run on.

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It also means that we can almost say goodbye to those long

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list of hardware requirements that we used to check before

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trying any new software.

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The requirements are still there, but they are quite standard.

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Web apps also improves speed.

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Now you might think that speed is just another performance parameter,

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but here speed can refer to non-laggy performance,

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faster updates, and overall faster growth of the organization in general.

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The speed is also representative of shorter product

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development cycle, since rollout of updates will be faster

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and user feedbacks can be taken and addressed quickly.

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As we just mentioned, since the hardware requirement

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to access such apps are fairly generic, like basic consumer OS

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and web browsing capability,

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these applications can be accessed by wider range of devices

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by more and more consumers.

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In fact, many of the popular social media and utility apps

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also serve wearable devices.

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The policy of not owning but accessing the data also improves

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the overall security of both consumers and hosts,

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and all of it leads to a better IT economy.

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It is not just about apps becoming cheaper. After rise of web apps,

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many revenue models like Freemium, Pay as you go, and ad-based

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revenue generation have grown significantly.

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Not only that the transactions have become more transparent

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on all ends, like businesses, consumers, and even the governments.

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Finally, the nightmare of business makers, which used to

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haunt them for decades, has become quite a Disneyland.

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Yes, we are talking about scaling.

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Companies don't have to invest into underutilized hardware,

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they can scale as they grow.

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Since, now we have a fair idea of what are web apps

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and why do we use them,

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let's get straight to the business.

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There are three steps to the process of making web apps.

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First, make it or build it on the suitable environment.

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Second, wrap or pack it with necessary support and instructions

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to ship or deliver it to the intended client or consumer.

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And finally run it on your machine or host it on your server

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for others to access it. In next lecture, we will get started

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with creating web applications.