It's Sun Java, it allows you to view java applets on the web. If not allowing it isn't affecting your surfing then don't allow it. You can always allow it again using your firewall settings if you decide you need it later.
Surface Pro (2017) vs Surface Pro 4
20 groundbreaking 3D animation techniques
How to mine Bitcoin on Mac
Synology invites you to visit them at Insomnia on 26th – 29th August. Book your tickets now and visit Synology.