A flat structure is an organizational design that minimizes the levels of management between staff and executives. In this setup, there are few or no middle managers, allowing for a more direct line of communication and decision-making. This can lead to faster responses to issues and a more collaborative work environment. In a flat structure, employees often have more autonomy and responsibility, which can enhance job satisfaction and innovation. Companies like Valve and Zappos are known for using flat structures, promoting a culture where team members can contribute ideas and take initiative without excessive oversight.