Human beings are social animals and we live in a interconnected world. Almost all career paths involve working with others toward a common goal. Every student is regularly responsible for being part of a team, whether it be in sports, class groups, clubs or extracurriculur school activities, and for taking responsibility for their part on the team. They are expected to share the workload, encourage other team members, build on other team members' strengths and help to alleviate weaknesses, resolve differences and take personal responsibility for accomplishing team goals.
Getting things done efficiently in a group by taking advantage of each person's skills. To me teamwork is an important skill because in ones career, one must often work with a team to accomplish various tasks.