Horizontal groups are organizational structures where members are grouped based on similar roles or functions rather than a strict hierarchy. This approach encourages collaboration and communication among team members, allowing for a more flexible and adaptive work environment. In horizontal groups, decision-making is often decentralized, empowering individuals to take initiative and contribute to the group's goals. This structure can lead to increased innovation and faster problem-solving, as team members share their expertise and perspectives without the constraints of traditional top-down management.