An intranet is a private network, similar to the internet, that is only accessible to employees of a company. It uses the same TCP/IP protocols as the internet but has additional security measures like firewalls. An intranet allows employees to easily access important company information, applications, projects and culture through a single interface. It enhances productivity and knowledge sharing while reducing costs compared to traditional systems. Common uses of intranets include communication, decision support, sales automation, document management and customer support.