Unsupervised Techniques: Clustering — Partition based technique (K-means) and Hierarchical Clustering (Agglomerative and Divisive Clustering) Dimensionality Reduction Techniques — Principal Component Analysis, Factor Analysis and Singular Vector Decomposition Market Basket Analysis — Apriori Algorithm, FP Growth Technique. Time Series Analysis : Stationarity condition, Auto-Regressive model, Moving Average Model, ARIMA, ARIMAX, SARIMA. Recommendation System: Collaborative and Content Based filtering recommendation system Text Mining: Text Data Preparation techniques, Text Classification, Sentimental Analysis, Topic Modelling and Name entity recognition.