Intra is a prefix that means inside or within, an intranet is a digital workspace for your firm that centralises and streamlines every person, document, tool, discussion & project
An intranet is a network where employees can create content, communicate, collaborate, get stuff done, and develop the company culture
An extranet is similar to an intranet, but also provides controlled access to authorized customers, vendors, partners, or others outside the company
Intranet is highly secure and has a small number of visitors. it is used in order to get employee information, telephone directory etc
extranet also have private network so only those who have a valid username and password can use the extranet. Extranet is used to check status, access data, send mail, place order etc