Files that contain the .vmdk file extension are Virtual Machine Disk Files. These files store the contents of a "virtual" hard disk that has been created by the VMware virtual hard drive software.
The VMDK files that are created by the VMware software can be used like an actual hard drive to store information and back up important computer data. The virtual hard disk can be made up of one or multiple VMDK files.
The number of VMDK files that are contained on a virtual hard disk will depend on the size of the virtual disk and how much data that a user has stored on it.
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If you have additional information about the VMDK file format or software that uses files with the VMDK suffix, please do get in touch - we would love hearing from you.