Courtesy of Apple

iCloud is a wireless syncing service that stores your music, photos, documents, and more... automatically. Launched in October of 2011, Apple replaced it's subscription based MobileMe service. iCloud is free to all users, but does offer users the ability to upgrade to larger storage options.

iTunes in the Cloud

Photo Stream

Documents in the Cloud

Apps, Books, and Backup

Calendar, Mail, and Contacts

Find My Friends and Find My iPhone

Find my iPhone