Purchase frequency refers to the rate at which a consumer makes a purchase of a particular product or service within a given period of time. It is a measure of how often a customer buys a specific item, and can vary greatly depending on factors such as personal needs, budget, and brand loyalty. A high purchase frequency indicates a strong demand for the product, while a low frequency may suggest a need for improvement in marketing or product quality. Understanding purchase frequency is crucial for businesses to effectively target and retain customers, as well as track the success of their marketing strategies.