What is it?

So does anyone really know how to work with a team?  My opinion of it is a team is a group of people who have the desire of accomplishing one goal.  Sure each member of this team has been taught differently, this makes the team unique.
A common definition is: You work with fellow members of the organization to produce these results. Even though you have a specific job function and you belong to a specific department, you are unified with other organization members to accomplish the overall objectives. The bigger picture drives your actions; your function exists to serve the bigger picture.