Purchase, often termed a “conversion” in marketing, refers to a prospect crossing the line and buying your product or service, becoming a customer.
A purchase signifies an exchange of currency for goods/services, indicating a sale and creating a new customer for your business. In marketing terms, it’s the payoff for generating awareness, engagement, and consideration, and it sets the next stage for the customer’s journey.
In marketing, a purchase marks the end of one part of the customer’s journey — and the start of another. Once a customer buys your product, they are now primed to work toward the ultimate payoff in marketing: Becoming an advocate.
References
https://en.wikipedia.org/wiki/Purchase_funnel
https://www.skyword.com/contentstandard/how-the-marketing-funnel-works-from-top-to-bottom/