What is the use of Extranet, Internet and Intranet sites in Sharepoint 2010?

What is the use of Extranet, Internet and Intranet sites in Sharepoint 2010?

- Intranet Site in Sharepoint 2010 provides the management of the documents and files within the same location and provides a centralized access to the applications.

- Extranet Sites in Sharepoint 2010 provides password protected access to the people and information and it also uses the web technology to make it easier for people to use it.

- It supplies business process and provide a shared collaboration to people and enterprises.

- Internet sites in Sharepoint 2010 use the publishing feature and provide a way to manage the larger public information and websites.

- It is used to manage the large database and provide the information to the larger public that is being attached to it.