"Ideas forum" is a place where users can suggest and vote for new features of your app. Or report bugs, request improvements or provide other kinds of feedback. Once a user suggests an "idea" other users can "vote" for it.
A user has to be logged-in to suggest a new idea, but voting does not require logging in.
Technicians can also create new ideas from existing helpdesk tickets to requrest more user feedback in the forum.
When an new idea is posted, administrators get an email notification. When someone adds a comment to an idea, the idea creator gets an email notification.