What is Confluence?

Confluence is a content collaboration tool used to help teams to collaborate and share knowledge efficiently. With Confluence, your users can create pages and blogs which can be commented on and edited by all members of the team. 
For example, you will be able to create a roadmap easily, create notes containing checklist, create a knowledge base and centralize everything in one place. You can also attach files, like your excel planning and display it on a page for more convenience. Confluence has also been designed to integrate with Jira and they have many integration points, giving Confluence users the ability to view, interact with, and reference Jira issues from a wiki page. 

Getting started with Confluence