Who is defined as someone who purchases or uses an organization's services or products?

The term that accurately defines someone who purchases or uses an organization's services or products is "customer." Customers are individuals or groups who buy goods or services to fulfill their needs or wants. This relationship is crucial for any business, as customers drive sales revenue and are essential for the business's growth and sustainability.

In contrast, a vendor is typically a supplier or a provider of goods or services that an organization may utilize in its operations but does not directly relate to the end-use of products. A client usually refers to a person or entity that engages the services of a professional, such as a lawyer or consultant, indicating a more specialized service relationship. Stakeholders encompass a broader category, including anyone with an interest in the organization's performance, such as employees, investors, and the community, not solely focusing on those who purchase or use its products or services. This distinction highlights why "customer" is the most accurate choice in the context of someone who uses an organization's product or service.