What is a oem partition

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(I understand there is a 4th only visible with Diskpart and that is fine) OK so far.now I notice that the Recovery Partition is visible in Disk Optimize and like the other partitions is all stored on my SSD boot up drive. So upon a clean install, three visible partitions are created, Recovery (300mb), EFI (100mb), and the regular Windows partition. Just switched out from Windows 7 to Windows 8.1 Pro 64bit Full Edition and I have to say I am a little confused about Windows 8.1 Recovery.