Final answer:
The free food samples provided by Sam's Clubs represent a sales promotion communication method called product sampling, aiming to boost sales and customer interest through firsthand product experience.
Step-by-step explanation:
The food samples offered by Sam's Clubs on Saturdays are an example of a sales promotion communication method known as product sampling. Product sampling is an effective technique where potential customers are given a chance to try a product for free with the intention that the experience will lead to increased customer interest and sales. By providing free samples of their frozen food items, Sam's Clubs hopes to entice shoppers to purchase these items by giving them a firsthand taste of the quality and flavor, leveraging the immediate sensory experience as a powerful promotional tool.