Deep learning (DL) is a branch of machine learning based on a set of algorithms that attempt to model high level abstractions in data. It is a new area of Machine Learning research, which has been presented with the goal of drawing Machine Learning nearer to one of its unique objective, Artificial Intelligence. Deep Learning is used by Google in its voice and image recognition algorithms, by Netflix and Amazon to decide what you want to watch or buy next, and by researchers at MIT to predict the future. DL is used in various fields for achieving multiple levels of abstraction like sound, text, images feature extraction etc. DL is about art of different fields for accomplishing numerous levels of deliberation like sound, content, pictures include extraction and so on. We have done an extensive literature review and surveyed the application of deep learning techniques on various fields. This book will provide an intuition to apply this DL on selected fields like image processing, data analytics, speech recognition etc