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An intranet is a computer network for sharing corporate information, collaboration tools, operational systems, and other computing services only within an organization, and to the exclusion of access by outsiders to the organization.

Advantages:

• Intranets offering workforce productivity which can help user to find and observe information very fast. User may also use applications according to their roles and tasks. Through web browser a user can get access to entire contents of any website from anywhere or any time. Intranet also increase the ability of employee’s by performing their job confidently very fast, and accurately.
• Intranet permits business companies to share out information to employees according to their need or requirements. Employees may also link to appropriate data at their expediency.

Disadvantages

• Management does need to stop control of specific information, this problem can be minimized but with appropriate prudence.
• The other disadvantage of Intranet is security issue
• Intranet gathered everything in one location which is really good but if it is not prearranged then you will spoil everything.

Hope this will helps.