As the topic have very vided area and in one book try to cover all aspects could not be possible. Hence we care about our target in the selection of articles. This book is collection of articles. We tried to collect articles from each area from the topic. We also care that we could produce a quality collection to the readers. Many research and literatures are available before this book in the market and they have their own flavor. We have tried to fill the gap of fragrance of the available market. We thank all of contributors, who made effort to write articles and provide us timely. Some of the papers have been taken from earlier editions of the journals published by VL Media Solutions. These articles are fulfilling the gap of this academic thrust.