The KDD process involves several steps: data cleaning to remove noise, data integration of multiple sources, data selection of relevant data, data transformation into appropriate forms for mining, applying data mining techniques to extract patterns, evaluating patterns for interestingness, and representing mined knowledge visually. The KDD process aims to discover useful knowledge from various data types including databases, data warehouses, transactional data, time series, sequences, streams, spatial, multimedia, graphs, engineering designs, and web data.