What is 'Other' storage on IPhone 4 and how to get rid of it?

I have just over a gb worth of other storage i have tried wiping and restoring my iphone. I know there are some apps to view the 'other' but i don't want to pay for them, is there any free apps similar to this without jailbreak or any other ways to get rid of it?

They are files that aren't movies, music or photos. If you have drop box on your phone then that stores things in Other. Also loads of apps that create things or let you open other documents store things there too.
If you connect it to your computer then go to Itunes, then to the Apps tab, scroll down and there should be a bit about Apps that can store things on the iphone. You should then be able to see what the apps are storing.