 So, before I begin the session, I'd like to thank the organizers, especially Nareesh. He has been really, very helpful and he has arranged a wonderful event and I hope you are learning a lot and especially the people sitting here as well as the presenters are learning a lot from you all. And so, I hope that during my presentation I'll also be learning a lot from you all and hopefully you will also get to learn something from me. Let's start with some information about me. I am Mohammad Aman Khan. I work as a front-end developer in Applied Research Works. It is basically a health-related company. It does stores information related to patients and doctors and the performance of different doctors helps the payers, the insurance companies with the information and it helps the doctors to find out information about the patients to take care of them and also does a lot of visualizations of those information. So, basically before we started using D3, we were doing visualizations using high charts and tabu. We were experimenting with Google charts and high stocks also. We were not working till before six months with D3. We had no information what D3 is or how powerful it is. But then I was asked to do some information, some experimentation regarding the other libraries that are present which can do wonderful visualizations. So, before we go into that, we will have to understand what big data actually is and why visualization is that important and how visualization can actually help us or in some places, in some scenarios, actually harm us. So, we are basically living in a scenario where we have too much information given to us. But this too much information, the word too much is something which is relatable. Till a few days back, information that was actually not that much that we have right now, seemed to be too much to us. But right now we have, the processors have become very much powerful. We have more storage spaces and we have much more processing speed. The internet speed is getting better, especially in India. And so, the information which was actually too much a few years before is not actually that much right now. So, during this presentation, I will be going, touching aspects about big data, what actually it means and what are the different categories of big data that we have right now. We will also be focusing on the different types of visualizations that are there. We will try to figure out the different characteristics that are present in the different data, where we can identify which particular type of visualization we should use for that particular data. We will be covering the different types of visualizations that are there and especially that can be used to visualize using D3. And then we will be trying to learn about the different phases that D3 itself provides us, the kind of data binding it actually just to the DOM element.