When trolling with outriggers you can troll with more lines in the water, thus pulling more bait which simulates a school of fish.  Outriggers will eliminate tangled lines. Each outrigger can accommodate one or two lines from your rods and reels.  The line is used with a release clip that extends to the end of your outrigger. 
When a fish strikes your bait, the release clip will allow your fishing line to come free of the outrigger so you can reel in the fish.