Which Partitions Does Windows 10 Create?

As it's installed on any UEFI / GPT machine, Windows 10 can automatically partition the disk. In that case, Win10 creates 4 partitions: recovery, EFI, Microsoft Reserved (MSR) and Windows partitions.

What are the default Windows partitions?

The default partition layout for UEFI-based PCs is: a system partition, an MSR, a Windows partition, and a recovery tools partition. This layout lets you use Windows BitLocker Drive Encryption through both Windows and through the Windows Recovery Environment.

Does Windows 10 install create partitions?

Windows 10 installer will only show hard drives if you choose custom install. If you do a normal install, it will do the creation of partitions on the C drive behind the scenes. You normally don't have to do anything.