Is everything on my iPhone, iPad and iMac that is synced between these devices stored on my itunes account?

I have an iPhone, iPad, iMac and iTunes.
I install apps on my phone and I install apps on my iPad, I buy videos via itunes via my ipad, I make voice memos on my iphone, I upload sound recordings to iTunes, I transfer CD's to itunes.
Question: If say everything on my iPhone and iPad is stored on my itunes account  when I connect the devices to my imac (Because I can see them when I look on iTunes) can I then delete any of these apps and sounds and music and TV shows from my iPhone and iPad (To say save storage on my iPad or iPhone) but still be able to access them in the future?
I am really confused about where everything is. If I get something from one device then is that device the mothership so to speak and I mustn't delete anything from whichever device I got it from?
A general description on the whole theory of how everything syncs would be appreciated. And I don't mean the basic Apple videos which don't tell you what happens if you want to delete things. Something that explains it in laymans terms.
Cheers
Anm72

Anything you purchase from Apple can be re-downloaded later for free. These files are downloaded to the devices when you sync them or use the iTunes Match service. Even if you deleted an app from all 3 of your devices, it would still availiable to you in the "Purchased" sections in the App Store, iTunes Store, and other Apple digital stores.

Similar Messages

Maybe you are looking for