Data Science is a combination of statistics, data analysis, and machine learning techniques to analyze structured or unstructured data and extract knowledge and insights from it through a process of analyzing, programming, and business skills. In this book, Unit-1 gives the difference between Big Data and Data Science. Unit-2 had some aspects of Mathematics and statistics which helps in effective the Data Science process. Machine Learning techniques along with Regression analysis were discussed briefly in Unit-3,4,5. In Unit-6, Concepts of Data visualization were summarized.