The idiomatic expression "an integral part of something" means that it is an essential and indispensable element, without which the whole would be incomplete. In this context, being an integral part of a team implies that the individual plays a crucial role in achieving the goals of the group through their contributions such as skills, knowledge or effort. This phrase can also imply that the person is well-respected and valued by their colleagues for their positive attitude, cooperation, and dedication to the success of the team.