Final answer:
A group of people with complementary skills working towards common goals is called a team. Teams differ from informal groups or crowds as they are goal-oriented with cohesive roles for members.
Step-by-step explanation:
A collection of people with complementary skills who regularly interact to pursue common goals is called a team. This definition is distinct from other types of groups or gatherings. Informal groups, for instance, may not have a specific or aligned goal, and their interactions are often casual. In contrast, formal crowds and conventional crowds may gather for scheduled events, but do not necessarily work together towards common objectives in the same way a team does. Teams are characterized by the cohesive effort of their members to achieve shared targets, often having clearly defined roles within the group, and a sense of shared identity.