I would like to express my gratitude to my father for being such a wonderful inspiration in my life, and my mother for being the most supportive person that I have ever seen.

I would like to thank my family, professors at the university, friends at Mozilla and Packt Publishing, and the many people who helped me through this book.

Then, I would like to thank Shubham Oli, who helped me to write chapters 6 and 7 and also to develop the various applications that have been included in this book.

I would also like to mention the names of my professors—Dr. H.L. Mandoria, Sanjay Joshi, Rajesh Shyam Singh, B.K. Pandey, Ashok Kumar, and S.P. Dwivedi of the College of Technology, Pantnagar—who encouraged and supported me in writing this book.

My deepest gratitude to all the teachers who have taught me from kindergarten to engineering.