Read the definition of "product of activity"
A product is a well-manufactured product or service that does not require further development, for which money or other values can be received.
Based on this definition, any employee produces a "product" and this is the reason why the organization gives a reward to a person in the form of a salary and other things.
For example. For the baker, the "product" of his activity is the bread. The "product" of the doctor's work is the cured patient. For the receptionist, the "product" will be phone calls properly routed to the right people.