They represent an organization, selling products and services on its behalf. Travel agents sell vacation packages on behalf of large companies; insurance agents work from an office or go door-to-door; and real estate agents deal with property, from advertising through sale. These professionals don't own the products or services they represent, but sell them in return for a flat fee or commission. Sales agents need a winsome personality, as they must often convince potential buyers to part with large sums of money. They also must have incredible self-motivation and ambition, as their pay usually depends on performance.