Peer reviewing (also called peer-editing) means people getting together to read, comment on, and recommend improvements on each other's work. Peer-reviewing is a good way to become a better writer because it provides experience in looking critically at writing. Team writing, as its name indicates, means people getting together to plan, write, and revise writing projects as a group, or team. Another name for this practice is collaborative writing—collaborative writing that is out in the open rather than under cover (where it is known as plagiarism).
McMurray, David, "33. Strategies for Peer-reviewing and Team-writing" (2016). Sexy Technical Communications. 33.