I've noticed that I have used quite a bit of space recently on my Mac.
I downloaded about 200 apps within iTunes and I'm not sure if I needed to.
The apps are downloaded on my iPhone and iPads and I don't use them on my Mac.
Therefore, presumably, I dont need them also downloaded on my Mac and can therefore delete them? (if so, how?)
If they are within iTunes on your Mac... leave them there as they are your Backups.
If you Delete them from the Mac and need to Restore your iDevices then you will have to Re-download the Apps.
Retrieving data ...