Teamwork or Work Groups

There have been many observations that there's no "I" in team, and with mere syntax, this is correct. However, there are plenty of differences between Teams and Work Groups. Just because your department has a small group focused on a set of tasks or a product launch does not make you a team. I wouldn't assume that a dept manager is the same as a team leader. (Source)

Here's a simple breakdown between the two:

Work Groups	Teams
Individual accountability	Individual and mutual accountability
Come together to share information and perspectives	Frequently come together for discussion, decision making, problem solving, and planning.
Focus on individual goals	Focus on team goals
Produce individual work products	Produce collective work products
Define individual roles, responsibilities, and tasks	Define individual roles, responsibilities, and tasks to help team do its work; often share and rotate them
Concern with one's own outcome and challenges	Concern with outcomes of everyone and challenges the team faces
Purpose, goals, approach to work shaped by manager	Purpose, goals, approach to work shaped by team leader with team members