Market segmentation involves dividing customers into subgroups where members are similar in certain characteristics and behaviors. It is useful for developing targeted marketing strategies. Common segmentation bases include demographics, behaviors, and geographic location. Methods like k-means clustering and hierarchical clustering are used. Market basket analysis examines what products customers frequently purchase together to identify cross-selling opportunities. Association rule mining and similarity measures are analytical approaches used. It provides benefits like increased sales and customer satisfaction from tailored product offerings.