The difference between team and group dynamics
Although team dynamics are very similar to group dynamics, and the terms are often used interchangeably, there is an essential difference.
Groups are a social community, consisting of two or more people who have something in common.
A team is a special instance of a group in which the commonality is a shared goal. This fact, itself, creates a dynamic between team members because they are dependent on each other for success. For example, a sports team wins or loses as a whole.
The word “team” is sometimes used, incorrectly, to refer to a group. For example, many sales “teams” are groups - because the sales people are incentivised individually. A sales person wins commission based on his/her own sales, and is not affected by the performance of other sales people.