A sales clerk works in a retail store helping customers choose which products to buy. He or she has to keep both the customers' specific needs and the company's profits in mind while remaining friendly, knowledgeable, and helpful. In some stores, sales clerks may also act as cashiers or perform a number of other tasks. Though this position is usually open to people of all experience levels, those with more training or experience may have better salaries or be promoted into management positions.