OneDrive is a service from Microsoft and they offer 5 GB for free.
Some features of OneDrive:
- OneDrive has some powerful features to help you find what you need, co-author documents, and keep your files and photos organized.
- OneDrive is pre-installed on Windows 10, enabling your documents and photos to be saved to OneDrive automatically.
- Photos saved in OneDrive are automatically tagged based on visuals and OneDrive albums help you keep them organized and searchable.
- PDF annotation on your iOS device allows you to highlight, draw, and sign any PDF file in your OneDrive.
Source: OneDrive