A SharePoint team site connects you and your team to the content, information, and apps you rely on every day. For example, you can use a team site to store and collaborate on files or to create and manage lists of information. On a team site home page, you can view links to important team files, apps, and web pages and see recent site activity in the activity feed.
https://support.office.com/en-us/article/What-is-a-team-site-75545757-36c3-46a7-beed-0aaa74f0401e