A group of companies is a collection of firms that are related to each other in some way, usually through ownership or control. This can include a holding company and its subsidiaries, as well as associates and their holding company. The companies within a group often have common goals and may work together to achieve them. By grouping together, companies can share resources, expertise, and expenses, which can lead to efficiencies and cost savings. Additionally, a group of companies may have a stronger market position than any of its individual members, which can be advantageous in a competitive industry.