Cloud storage is where your information & data is stored on remote computers accessible via the internet using your chosen device such as a phone or desktop computer.
Many benefits come from hosting your data externally using a cloud store service.
Examples of Cloud Storage
Google Drive
https://www.google.com.au
Dropbox
https://www.dropbox.com
Microsoft OneDrive
https://onedrive.live.com
iCloud
https://www.icloud.com
Amazon Drive
https://www.amazon.com