A business or an activity that involves selling of goods and services is known as sales. Sales is the final stage in marketing and it involves 4 Ps (place, product, price and promotion).
You are the one who increases the number of customers by convincing and persuading them to buy a product or service. Mention your skills because the interviewer might be eager to know them. Also, rate your skills which are required in the field of sales.   _{Your Comment}