An intranet is a private network that secures a company's internal website and other knowledge-based, collaborative, and communication platforms. The purpose of an intranet is to facilitate a swift exchange of documentation and other work-related content, assign and manage tasks, manage collaborative projects, and provide access to information. 

Most intranets comprise a hub or a central repository for storing important documents and vital files and policies. They can also serve as a chat that foster active interaction among members of the company. 

The benefits of using an intranet include enhanced efficiency, optimized collaboration, effective knowledge sharing, active communication, and much more. 

SharePoint is a leading solution for providing a functional and effective intranet. Some other alternatives include Workplace by Facebook, Simpplr, Samepage, Zoho Connect, Confluence, Jira, Huddle, and more. 

Companies using SharePoint for intranet

Over 250,000 companies are using SharePoint to facilitate collaboration and communication. These include big names such as CitiBank, Citrix, Proctor and Gamble, Kroger, Chrysler, National Australia Bank, TomTom, Viacom, Dell Financial Services, The UPS Store, and Johnson Controls, just to mention a few. A more exhaustive list can be found here.