SharePoint 2010 Sites provides a single infrastructure for all your business Web sites. Share documents with colleagues, manage projects with partners, and publish information to customers.
Think of SharePoint 2010 Sites as a “one-stop shop” for all your business Web sites. It provides a full set of tools that your people can use to create any kind of site, plus a single infrastructure that simplifies site management. From a team site for colleagues, to an extranet site for partners, to an Internet site for customers, people can share and publish information using one familiar system.