They offer access to an in-house team of designers, writers, videographers, and inbound marketing strategists that act as an extension of your current staff. For companies without a marketing department, they can act as your virtual marketing department by providing outsourced marketing services for a fraction of the price of hiring a full-time person. If you have a marketing department, their team is adept at working with existing marketing personnel, often taking care of tasks that your internal team does not have the time or expertise to handle.