iCloud and OneDrive
Would iCloud give you access to Onedrive storage? What's the difference?
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iCloud is an Apple service; One Drive is a Microsoft service. You can use either one or both for some things. If you have Apple devices (iPhones, iPads, Mac computers), iCloud is generally the better choice as it can be tightly integrated with those devices and can automatically sync many things (e.g., Photos, files, contacts, notes between devices if desired.
iCloud does not give you access to One Drive storage and vice versa.
Also see: Introduction to iCloud - Apple Support
and
https://www.microsoft.com/en-us/microsoft-365/onedrive/online-cloud-storage