Professional competency is the ability to demonstrate knowledge and skills that are relevant and valuable to the customer. By collecting and processing information on products, competitors, and industries, a sales rep can show their expertise, credibility, and confidence in providing solutions that meet the customer's needs and expectations. Reference: https://trailhead.salesforce.com/en/content/learn/modules/sales-representative-certification-prep/sales-representative-certification-prep-prepare-for-your-exam