A Microsoft file hosting and synchronization service.
To get the 1TB of storage on OneDrive, you would need to purchase a personal Microsoft 365 subscription, with that you will get 1TB of OneDrive storage and also the use of all the Office apps like Word, Excel... etc.
https://www.microsoft.com/microsoft-365/buy/compare-all-microsoft-365-products
All OneDrive plans are explained on this link:
https://www.microsoft.com/microsoft-365/onedrive/onedrive-plans-and-pricing