The definition of TEAM-

A team is a group of people  linked in a common purpose.

A group does not necessarily constitute a team.
 Teams normally have members with complementary skills and generate synergy through a coordinated effort which allows each member to maximize their strengths and minimize their weaknesses.

Team members need to learn how to help one another, help other team members realize their true potential, and create an environment that allows everyone to go beyond his or her limitations. Teams can be broken down into from a huge team or one big group of people, even if these smaller secondary teams are temporary.

A team becomes more than just a collection of people when a strong sense of mutual commitment creates synergy, thus generating performance greater than the sum of the performance of its individual members.