Final answer:
At trade shows, the primary type of promotion is Personal Selling, which involves direct interaction and engagement with potential customers.
Step-by-step explanation:
The type of promotion that takes place at trade shows is primarily Personal Selling. Trade shows offer businesses the opportunity to engage directly with potential clients and customers. At these events, company representatives can showcase their products or services, demonstrate their benefits, and answer questions in a face-to-face setting. This direct engagement is a form of personal selling, as it involves interpersonal communication skills to persuade potential customers.