Teams can have two, three, or four players, but however many are on team, each one has to play one full "round of blinds" or the team will be disqualified. Also, players can tag in and out between hands, but not during a hand.
Now, playing poker in teams can indeed support team building in several ways. When I talk about playing in teams, I'm referring to the so-called Team-Poker-Concept, where people don't play by themselves BUT in groups of usually 2 or 3 people.