Data Mining is the process of extracting useful patterns and knowledge from large datasets using statistical techniques, machine learning, and algorithms. Java, a widely-used programming language, is well-suited for data mining due to its robustness, portability, extensive libraries, and its support for various machine learning and data mining tools. Involves cleaning, normalizing, and transforming raw data into a structured format suitable for analysis. This can include dealing with missing data, outliers, normalization, and data transformation.