iCloud is the general name for all services that Apple offers over the Internet, whether on a Mac, iPhone, or Windows PC (an iCloud for Windows client is available).
iCloud EXPLAINED! Here's what you need to know!
These services include iCloud Drive, which is similar to Dropbox and Google Drive; iCloud Photo Library, which is an offshoot of Photo Stream; iTunes Match; and even Apple Music. iCloud also gives you a way to back up your iPad in case you need to restore it in the future, and while you can download the iWork suite to your iPad from the App Store, you can also run Pages, Numbers, and Keynote on your laptop or desktop PC via icloud.com.
Below are some of the features you get with iCloud, along with some tips on how to use them:
Apple offers 5GB of free iCloud storage for Apple ID accounts, the credentials you use to sign in to the App Store and buy apps. You can use this storage for a variety of purposes, including storing photos, but it may be best to back up your devices.