ICloud is Apple’s umbrella term for cloud-syncing feature. Basically, anything that is backed up or synced with Apple’s servers is considered a part of iCloud.
The purpose of iCloud is to store data securely on Apple’s remote servers. All your data is backed up and synchronized between all your devices. This allows you to retrieve your data in case you lose your smart device.
If so, you simply log into iCloud.com to retrieve your data or sign in with your Apple ID to automatically restore your data on your new smart device.
This is for smart devices and desktop/laptops. Screenshots are from iPhone and PC

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Sign In On Your Apple Device
Visit iCloud.com on your smart device and sign in with your Apple account to see what services are cloud synced.
When you sign in you can access most of these features:
- Photos
- Notes
- Reminders
- Find My iPhone
Refer to below image:

Your Account Settings
From your smart device, you can also access your Accounts Settings by clicking the blue link. Here you can view your Storage. See below image:

To see everything that your iCloud account is backing up, open the Settings app on your smart device, select your Profile at the top of the list, then navigate to the iCloud section. Here you can enable or disable app data backup. See following image;

Manage Storage
To manage your iCloud storage. Click on the Manage Storage section. Refer to below image:

Here you can upgrade to a monthly storage plan for more storage by clicking on Change Storage Plan. See below image:

You can purchase 50GB for $.99, 200GB for $2.99 or 2TB for $9.99 per month. See following image:

Sign In On Your Desktop
Visit iCloud.com on your iPad, Mac or desktop and sign in with your Apple account to see what services are cloud synced.
When you sign in on your iPad, Mac or desktop you gain access to most of these features:
- Photos
- iCloud Drive
- Notes
- Calendars
- Contacts
- Settings
- Reminders
- Pages, Numbers, or Keynote*
- Find My iPhone
- Find My Friends
See below image:

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