What is that list of apps I see after double-clicking the home button?

When you double tap the home button on my ipod touch 4th gen it comes up with a list of apps that have been open! Are they still on? If they are does it waste your battery if you dont close them? Thanks! 

treshz98 wrote:
...Are they still on? ...
No...
treshz98 wrote:
... does it waste your battery if you dont close them? Thanks! 
Not necessarily...
But there is no harm in Closing the Apps you are not using...
More Info here  >  http://support.apple.com/kb/HT4211

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