Documentation regarding the JIRA integration seems to be lacking, so I have a question.

I see that some forum posts mention that the integration is not a two-way integration, and according to some youtube video, it seems as that when a issue is created in Jira (from SD), in order to get updates in the SD the SD technican will manually have to initiate a update.

So just to be sure, if we do a integration between a on-prem ServiceDesk Plus, and a on-prem Jira installation, will the integration enable us to create an issue in Jira from SD, and when updates are done in either side, they will automatically be updates on the other side?

If not, what does the integration actually give, does it do anything except the option to create the request it self? 

If there is some articly that I havent found explaining the benefits of the integration, I'd be happy if someone could point me in that direction.