Data Mining is a technique of discovering interesting patterns from large amount of data, where the data can be stored in the database, data warehouse, or other information repositories. The volume and variety of data is increasing day-by-day due to the wide application of information technology. To analyse these data to get useful information, data science is used that applies tools and techniques such as data mining, machine learning, Statistics, etc., for analysis. This book introduces you to several concepts of data mining and their practical implementation using WEKA toolkit and Neural Designer toolkit.