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How to segment customers 
Determine whether you need to segment your customers. 
Customer segmentation is a useful tool for a business that has many customers and a wide array of different interactions with each of them. It allows the business to identify the different customer groups that they primarily serve and how they specifically interact with them.
Small businesses may have no need to segment customers, especially if they only serve a small, manageable set of them. However, for businesses with more customers, customer segmentation is indispensable.