Clustering is the unsupervised categorization of patterns into groups. The clustering is used in a variety of fields, reflecting its broad appeal and use as a phase in exploratory data analysis. Clustering algorithms are used to find groups of similar items in multiple data sets.
Clustering is used in several ways:
marketers discover distinct groups in their customer bases and then use this knowledge to develop targeted marketing programs
When you conduct a Google Photos search, the suggested images are probably picked using cluster analysis, which searches for similarities in colors, objects, and so on.
Clustering is used in identifying cybercrime such as credit card fraud detection.