groups are assigned by organizations or managers, while groups form when members' purpose of getting together is friendship or a common interest.

Formal / informal group

Explanation:

In business , Formal group is established to handle a list of tasks that needed by the company to achieve its goal. These tasks are planned and structured by top managements and generally outside of the employees' control.

Informal group on the other hand, is a social groups that formed as the employees tried to fulfill their roles within the formal group. For example, some employees might find that they can get a long with a certain employees and choose to spend the majority of their breaks to socialize with them. Unlike formal group, the formation of informal group can be controlled by the employees.

christopher columbus sail the ocean blue 1492