Professional Service Firms are companies that sell specialized services that are "high" in both value and cost. These services are primarily targeted for use by businesses, although they may also be used by retail consumers. There is a wide variety of professional services available for purchase. A small list of examples include legal services, accounting services, printing services, manufacturing rep services, computer hardware services, and computer software services.
Professional services are typically provided on a time and materials basis or on a fixed price per project basis. Some companies also provide professional services on a staff augmentation or "rent a body" basis