What is the use of site collections in Sharepoint 2010?

What is the use of site collections in Sharepoint 2010?

- The site collection is the name given where it provides the grouping of sites that is being made with Sharepoint 2010.

- Every Web application consists of site collections that allow them to store more information in a group and manage them easily.

- The site collections have their own database and are associated with the content that is being given in the sites.

- The site collection shares the same properties with all the sites that are in the collections and associated with one another.