Help Question about running Apps/items

[HiImToni]

I have AT&T and I am only allowed a certain amount of minutes worth of data a month. I have the lower amount because I usually can tap into wifi in most places and I seemed to have it under control with my BB. I noticed when I was poking around my new Atrix 2 that under the "manage apps" section there was a "running" tab, which made me a little nervous because there are a TON of apps in there. If I am not tapped into a wifi are these items using up my data minutes even if I am not using them?