How to organize the knowledge base for the organization?

Question

Knowledge base

It is necessary to organize a knowledge base for employees, which will provide answers to questions and describe the main business processes.
Of the requirements:
- the system must be closed
- there must be a differentiation of rights, different departments should not see their own information
Perhaps someone came across and found a ready-made solution?
Google didn't help much.

Answer 1

Well, in theory, any wiki-like thing that you can stick on your server is suitable for you.
Try to look, for example, towards Confluence.

Answer 2

mixail82 , most likely your company already has a Help Desk system in which the knowledge base is available out of the box) In my experience, such systems cover 90% of all emerging cases and you even have to buy nothing. It will also be convenient for users, as they do not have to remember about different systems.

Answer 3

Closed - in the sense of the source is not available?
If paid support is required, then it is also available for open solutions, such as Activiti, Alfresco.